Question I`ve been using my PC for over year and got a problem never happened before.

[Yukinodesu]

I was playing a video game as usual and turned off my PC. Next morning when i turn on my PC display showed No signal but computer was turned on. And could not even access to BIOS. And things i have tried:
-changing DP to HDMI cable
-plugged monitor to CPU
-replaced CPU paste
-reinstalled every plug and cables etc
And the last thing i did is removed one of my RAM and it worked. So i thought DUAL CHANNEL of RAM is not working. After that i updated my BIOS. Still didn`t work with dual RAM.

Motherboard is Asus Strix Z-370E
RAM is GSKILL Trident Z DDR4-3200Hz
CPU is I7-8700K
Can somebody tell me what is the problem?

 

[norcalsc]

what GPU? and have you tried integrated graphics (gpu removed)?

 

[Wile_E_Coyote]

I would guess that the RAM module you removed went bad. Did you "touch it" prior to when your PC would not turn on? It could have been killed due to static electricity.

Since you have your PC working now, mark the suspected module with a magic marker (So you can easily identify it) and then try it in your PC again.

TURN power OFF - NOW, This time replace the GOOD one with the suspected "BAD" module and restart the PC. If it doesn't boot, then the module is definitely BAD.

But if does work, then it could be that the socket your memory was previously installed in is the issue. Either THAT or the memory was not seated correctly.

Good Luck!