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Black screen on startup and flashing padlock key

mich -  
karirovax Posted messages 3584 Status Membre -
Hello, I have an HP 620 laptop
the screen stays black at startup, the key with the lock blinks 3 times, stops, then blinks 3 times again and 3 times again (12 times in total) the fan is running, no suspicious noise
does anyone have a solution to this problem, thanks in advance

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karirovax Posted messages 3584 Status Membre 215
 
Hi

try disconnecting the RAM (clean it if there is any dust if necessary)

otherwise replace it with a new one.
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