Unable to boot: No signal on screen Solved

Question

Good evening everyone,

Thank you in advance for your responses and suggestions.

My problem is as follows:
My HP Pavilion t747.fr after over 2 years of good and loyal service will not start anymore since last night.
The screen indicates "No signal"... The graphics card does not seem to be the issue as the result is the same after changing it.
The screen and the cable are not the problem either (same result on another computer)...
No beeps on startup... the fans start up and the HD light turns on. The DVD drive seems fine...
But there is no way to access the BIOS of course.

The attempts I have made without success:
replacement of graphics card
CR2 battery... removed and replaced
checked power cables

I'm stuck, is it a motherboard or processor issue or both?
How can I simply check???

Configuration: Windows XP Firefox 2.0.0.3

Marcopolo · Accepted Answer

I solved this problem, indeed the residual charge preventing the boot!!
So I advise unplugging the power cord from the tower, turning on the PC to discharge the residual current, and then plugging the power back in. In my case, it worked.
Good luck to everyone!!

luapmada · Answer

Do you have an old generic PCI video card lying around, like the S3 Virge?

I often fix this kind of problem by using another slot, getting the device a bit riled up... usually, it even retrieves the display, then I turn it off, put the old card back in, and it works again...

VOYAGEUR25 · Answer

Hello, at first glance and without further details, let's apply the simplest method: unplug the 220V power supply, open your case, remove the "button-type" battery, which keeps the BIOS information, turn everything back on but still without the 220V power, put your button battery back in after checking that the 3V voltage is stable; if not, change it, reconnect everything, restart while checking your BIOS settings with F2. Good luck, keep me posted. Patrick.

gritchefr · Answer

Hello,

I have 3 RAM sticks 2X512 + 1 256 - installed for over 2 years.
I tried removing all the sticks and turning the PC back on; it made a noise.
I put one stick back in randomly - no result.
I removed and swapped the stick ... restarted => same situation.

I had removed the "button" battery but that didn't help.
I even tried to blindly reset the BIOS settings to default.
(following the instructions on the HP site F1 F5 enter etc.) it still didn't work... but then again, it was done blind.

Now, I'm not a technician and when you tell me "turn everything back on but still without the 220V" I admit I'm lost... what am I supposed to do without the 220V???

Otherwise, another question:
While browsing forums, I saw a discussion where someone said their CPU got stuck in "DANGER" mode and after unlocking it, everything was fine...
Has anyone heard of this type of manipulation, and if so, how can it be done??
Intel Pentium 4 530 processor socket 775 (I believe, but I can no longer access Everest / AIDA)

le druide · Answer

Hello,

You unplug the power outlet and if you have a power switch behind the tower, turn it off for 1 minute; otherwise, still with the plug unplugged, hold down the Power button for 1 minute.

Then restart to see if it's okay.
--
The druid without the potion.

gritchefr · Answer

Well, it's done... The thing is working again..

Why?
I’m not really sure, but by removing a particular RAM stick, the screen is systematically visible again, and access to the BIOS is OK..
And miracle, it reboots fine...

When I put this RAM stick back, sometimes it works, sometimes it doesn't work at all.....

So it's decided, I'm not putting it back anymore!!!

Thanks to everyone for your input.....

Obinos · Answer

Hello, I have a new desktop computer running Vista. I put it to sleep using the Mediacenter remote control. However, since then the screen no longer detects a video signal despite turning it off, unplugging it, etc. Nothing works. I've just received it, and I hope it's not a hardware issue. I'm not yet familiar with Vista, so it's possible that I made a mistake. I completely unplugged it and will check tomorrow. Otherwise, I will call technical support. Thank you in advance.

jijidegwada · Answer

Same for my girlfriend's tower!!!

The tower hasn't turned on for about 3 weeks, and last night I was supposed to work on the computer, and it refuses to give me a picture... it says "no signal", the fans start up, the CD-ROM spins, the hard drive starts, but the "no signal" appears.....

I opened the tower to take a look, but everything seems fine. I unplugged everything in the back and plugged it back in, but nothing works. What should I do? I'm hopeless at computers lol.

jijidegwada · Answer

up up up!!!

creole · Answer

Hello, remove and reconnect your memory stick.

poupounelea · Answer

Hello,
I have exactly the same problem as jijidegwada, except that I am more than a dunce. I unplugged, blew, and replugged the memory stick, the graphics card, and checked all the connections from the tower to the screen, and I still have the "no signal" message on the screen. What should I do? Buy a new graphics card or memory stick? And what if that's not it? I would have invested for nothing, plus I don't know any specifications of the PC because it's my mother's computer, and she threw away all the documentation.

baleys89 · Answer

Hi salon

After adding equipment to my case, it has become too small and it's too annoying to rummage around in it
I got a larger case and embarked on transferring everything to it.
The connections are the same, everything went smoothly in no time. Only 2 cables are of no use to me, one goes to the card reader (I don't think I have that connector on the MSI motherboard I bought in 2003), the other powers the front audio... but I don't really need it (the connection port doesn't match anything on the motherboard), so I didn't connect these two cables
After assembly, my issue is as follows:
The screen doesn't turn on, "no signal" (but it works on my other PC)
So I removed the video card and connected to the one integrated into the motherboard... same thing, no screen (I'm thinking it might be disabled in the BIOS... but without a screen, I can't get in)
Then I took the Nvidia from my other PC... still no screen, still "no signal"
I changed my RAM stick... nothing
I also changed its position... still no screen.
The cables are fine, plus I've tried others, the reassembly was done with care (anti-static wrist strap)
The next step... I think it will come from one of you because I'm starting to lose it, especially since the day before, the same equipment in the other case worked wonderfully;
Thank you in advance
P.S.: there’s probably already an answer on CCM but it takes hours and hours to find since CCM has become a bible.

bimbox · Answer

Hello, my computer screen displays "no signal" as well. I tried using another hard drive, changing the RAM sticks, but the result is the same every time. I dusted it off, cleaned everything, but nothing works. Everything seems to power on correctly, though... could someone please tell me what to do? Thank you.

bimbox · Answer

PS: I am on Windows Vista with G-skill 1GB memory.

Raohken · Answer

Hello!

When I turn on my PC, the tower lights up but doesn't send any signal to the screen or the keyboard. So I'm quite frustrated, knowing that this problem appeared suddenly, without me touching anything. The tower emits continuous "beeps," which doesn't reassure me.

Thanks for replying if someone thinks they have a solution.

ouch@ine84 · Answer

To address hardware issues and boot problems: No signal on the screen

PLEASE RESET THE CMOS ''refer to the motherboard manual provided with the PC upon purchase.
CMOS JUMPER IS NORMALLY RED IN COLOR..

SECONDLY

the trick consists of replacing the faulty components
WITH OTHER REPLACEMENT PERIPHERALS, and for that, a friend's PC might suffice
(but beware of the risks and dangers.. as electronic components are very fragile)
The lack of spare parts for some will undoubtedly be a concern!
Otherwise, test the replacement hardware until the PC functions again.

cricri · Answer

Hello, so my problem is a bit like everyone else's except that I just changed my motherboard because my old one had network issues and I received the new one yesterday. I just installed it, but the problem is that nothing displays on the screen, just no signal. I've swapped several parts to see if changing something would help, but nothing works. However, my graphics card is inserted into the motherboard, so if it's the card that's causing the issue, that's not great. Well, if you have an answer to my problem, please respond quickly.

Phil · Answer

Hi!
Same problem on an HP Presario since last night
When I turn on my PC, the fan lights up but doesn't send any signal to the screen or the keyboard.
So I'm really stuck, knowing that this problem appeared suddenly, without me touching anything.
Thank you for responding if anyone thinks they have a solution.

Anonymous user · Answer

In response to "Raohken," your beep may be coming from the RAM sticks; they might be improperly connected or defective. Try reconnecting them.

fathi_miloudi · Answer

Hello everyone Same issue, no signal, the only action taken before this disaster was removing the fan and its radiator from the base to replace it. But once the fan was put back in place, there was no signal on the screen. The CPU fan and the larger one are working perfectly, the hard drive seems to be functioning (slight vibration) No beeping upon startup but there are small crackling sounds like a mouse click Please help me, I can't afford to take my computer to a technician, it's so expensive even for a simple diagnostic.

Heaven · Answer

Same on my side with Acer E360! I've tried everything: changing the RAM stick, clearing the CMOS, removing the BIOS battery, changing the video card, internal cleaning (very dirty), nothing works, I still get a "no signal" The motherboard might be faulty!

Shnain · Answer

Hello everyone, I'm not reposting this but I'm offering a solution to those who, like me, have screens that won't turn on.

And I find it enjoyable to find the solution when others have resolved their issue.

If you have a graphics card, like a GeForce 8600 GT or another, not the original ones, connect the monitor cable to the graphics card instead of the PC.
All my friends have this problem, but it's just that they're connecting the screen to the PC and not to the new graphics card. ^^ There you go, bye.

jim l herissonne · Answer

Hello...  If I ever had the same problem and for me the solution was the following: On the "lid" of the tower, there is a safety feature, a kind of push button, which can be accidentally activated during a small bump!! It's just a matter of pressing it and it works... Strange you might say, but it's true There you go....

Miku_Chan · Answer

Hi, I have a big problem with my desktop PC (Acer):  My computer starts normally and then asks me to Start Windows Normally, Safe Mode, etc. I have tried everything, but it's always the same: I select start windows normally and then it says "No Signal" and restarts. I have tried Safe Mode and everything, but the same problem persists.. Thank you in advance! :/  P.S.: I’m not very skilled with computers.

56coccinelle · Answer

Hello, I also have the same problem as quite a few people, if not all participants in this discussion. After a quick dusting of a tower that was working fine, and after removing the fan and the processor cooler (AMD Athlon 64 x 2, running W7 with 2GB of RAM) just to clean it, once everything was put back together... Surprise, the screen shows "no signal" and yet the tower turns on, the fans work, the hard drive seems to be spinning, but there is no signal to the keyboard or the mouse. So I followed what was suggested at the top of the discussion, removing and swapping the RAM sticks, taking out and putting back the battery... But nothing works, I am unemployed so I can't afford to have it diagnosed and my only internet access is through an old laptop (oh miracle) that's 15 years old and runs like crazy, so it's not great for job searching.... SOS Thank you in advance for any answers you can provide and thank you for your support. Thank you all.

Carolane · Answer

It was for my part the memory stick that was not properly inserted...

Teazy · Answer

It doesn't work for me!!!

GODMONT · Answer

Hello everyone, I have an issue in the same style (this only happens to me lol) a test on a Notebook that had a broken screen due to a fall, I connected my screen to the Notebook to see if the operating systems were damaged.  Windows works until system startup. While Ubuntu works completely.  But the worst :-( is that now that I reconnect my screen to its original tower, and without having done anything else but use it for this test, all the screens I connect via the VGA port give me NO SIGNAL  I don't understand because I unplugged the screen's power supply and then plugged it back in after restarting the tower, I can hear the Windows opening sound from the tower because the speakers make the opening sound, and the hard drive is working, but sniff no way to get an image in Windows. The Notebook only displays an image via Ubuntu!  What's happening???

dgnex63 · Answer

Good evening, I had the same problem and by deducing, it's when I unplugged my drives that the image came back.

Sandy · Answer

Good evening, I have the same problem... Yesterday my computer froze, to the point where I had to force it off, and now I can't turn it back on :'( The tower lights up normally and the screen shows no signal. I tried holding the power button for 1 minute but the same issue persists. Please help me knowing that I am not good at taking apart and reassembling a computer or naming each piece... (A 19-year-old girl who really needs her computer)

pseudoman · Answer

Good evening, I have a problem that just happened with my desktop computer. I dusted off my tower, removed the components to clean the connectors, reconnected and checked if everything was properly replaced and securely connected. However, when I turned my tower back on, there was no usual startup beep and no signal on the screen.  I have tried all your methods in vain. Do you have any other suggestions to propose? Thank you, best regards.

Lambda One · Answer

Thanks to Korben and the Druid for the techniques and explanations of why it's cool...  Personally, after a week without turning on a tower, I was surprised and stressed to see it refuse to power on without having changed anything physically or virtually.  Anyway, after a first unsuccessful attempt to discharge the capacitor, I tried again by also removing the BIOS battery, and BINGO, it worked.  Big thanks again, good luck, and happy new year ^^

Chaobergine · Answer

Thank you, dear friends!

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