Hello!
I write here what worked for me. I had looked for DAYS for a solution to this. My problem had been that my pc (6 months old, personally assembled after loooong compatibility checks) would boot up and shut down normally for an entire night of use and then, OUT OF NOWHERE, the next day it would not boot whatsoever. The day after it would, the day after that it would not, once again.
Completely at random.
My specs:
ASUS p9x79
Intel i7-3820
4x4Gb DDR3 Corsair Vengeance (compatible: checked)
ATI 7700
solid state samsung hard drive
Antec Kuhler H2O 620 Liquid Cooling System
I found out that the DRAM led was solid red each time the system didn't start. I begun informing myself.
This is what I tried (I enlist only for your amusement: if you want to skip to the solution, just go ahead):
- removed the ram modules one by one and tried ALL the f****g possible combinations (one that worked TWICE, was A1, A2, C1, D1; dunno why!);
removed all the external connected devices;
- unplugged the graphic card;
- cleaned with alcohol the ram
- reverted to the original CPU fan by Intel
- installed an internal speaker: no sounds whatsoever
- re-set the conductive paste
- flash-updated the bios
- plugged all the possible pins that I thought useless (such as power button led and front-case audio jacks)
- re-set the cpu and cooling system four times, checking for bent pins
- tried different wires from the alimentator (600W, btw)
- punched the mobo with kong-fu internal techniques
- RMA's the vendor of the mobo.
Then I casually read a - alleged - stupid comment on another forum that said it was worth to try to loosen a bit the screws that hold the modo to the case, as it may cause some contacts...
Result: I'm writing on a perfect functioning machine once again.
I can't explain what happened.
Hope it will work for you as well!
DjGabriro