CPU not detected by the motherboard
Frederic1er -
Hello,
I just built my first PC by myself and without any help (maybe I shouldn't have!).
It includes:
- Motherboard: MSI MAG Z790 TOMAHAWK WIFI
- CPU: I7 14700 KF
- Graphics card: PNY GEFORCE RTX 4070 TI 12 GB
- DDR 5 VENGENCE 32 GB
- PSU: FOX SPIRIT HG 850W
- 1 SSD of 1 TB
- 1 SSD of 2 TB.
I think (I'm not immune to having made a mistake) that I've connected everything properly, but after checking, I notice, from the LEDs indicating the debugging status of the motherboard, that the light is red (CPU not detected or initialization failure).
I've been searching for over a day to find out what might be wrong.
Not being able to find it, I'm reaching out to ask for your help.
I'm at your disposal.
Thank you
9 réponses
Hello
There are specific power cables for the CPU on the motherboard, is it properly connected?
Post pictures of the inside of your case.
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Hello.
Either you haven't installed the CPU correctly.
Or the BIOS is not up to date and therefore does not recognize the CPU; to update the BIOS see this page.
From a distance, without having the PC in hand, it's difficult to tell you more.
bazfile
Moderator/Security Contributor.
A hello, an answer, a thank you are always appreciated.
Reseat the CPU and start again.
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It's true that for a first PC, this configuration is a bit too complex.
That said, the motherboard is not natively compatible with this processor; if the BIOS version is earlier than the version required for a 14700KF, it won't work. When and where did you buy this motherboard?
On this model, you can flash the BIOS without the processor installed specifically to address this kind of problem. There is a dedicated USB port and a button. You need to read the explanation in the manual. You must IMPERATIVELY follow the process; no improvisation is allowed.
What troubles me is that the huge CPU cooler you've installed hides the entire motherboard. If this is your first build, it would be very surprising if you haven't forgotten a connector somewhere, but we can't see anything because of the cooler..... I do see that you have plugged in both 8-pin CPU power connectors, using both is unnecessary, try with just one.
When you took it apart, you should have taken pictures.
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You left power 2 plugged in, try power 1 instead. On the power supply, did you take the right connector for the CPU? Not the ones labeled "pcie"?
If it's still not okay, try flashing the BIOS using the method without the processor.
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I have connected it as suggested to connector 1.
So, the LED turned orange but, barely 5 seconds later, it shut off.
Is there a tutorial to flash the BIOS? I admit that I'm starting to see my limits here.
Ok, so it reacts differently... I hope it's not your power supply that's the problem...
Are you sure about the cables coming from the power supply for power 1 and 2?? I've seen cases where there was a mix-up with 8-pin connectors meant for graphics cards, this one is a strict 8-pin or split into 2x4.
Is there a tutorial for flashing the BIOS?
You should definitely not follow a tutorial, it's explained in the motherboard manual, it's specific to each model, no improvisation, you have to follow it rigorously.
After that, if it’s still the same, you should consult a technician who has the equipment to test and check everything....
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Hello,
I have indeed connected the 2 CPU cables
linking the power supply to the motherboard