[HELP]Monitor goes black but PC stays on

My spec is.
Gigabyte Z77X-UD3H
i5 3570k
PSU Corsair 650w 80 Plus Bronze Certified Power
SAMSUNG 830 Series 2.5-Inch 128GB SATA III MLC Internal Solid State Drive
Corsair Vengeance 4gb
Cooler Master Hyper 212 EVO

So first i got 8gb ram but one of them was bad thats why i'm with 4 atm.
Also the CPU_FAN pins on the motherboard stoped working few months ago so im using a normal SYS_FAN2 for my CPU i set it manualy so its working fine.
Also i removed the turbo from the cpu settings so its default without turbo.
I have the videocard drivers clean installed.

Now the problem is this sometimes when i play a game the monitor goes black but the PC stays on(tried using the numlock key to see if it worked, it didn't).
The main issue is i can't find out whats the source of this problem.
I run a CPU tests,GPU tests,RAM tests everything works fine so i can't find a way to force the error and see where its coming from.

I'll be very happy if someone can help me out here.
Thank you.
5 answers Last reply
More about monitor black stays
  1. Have you tracked your cpu temps when you are gaming, or have you done a prime95 or intel burn test?

    Sysfan will run your cpu fan, but with no signal from the actual cpu fan header, I think you may be causing issues with bios. It may see the temp rise on the cpu, and keep trying to feed speed through the cpu header. When it encounters difficulty, it may be sending a cutoff signal to the gpu or some such.

    Run a cpu stress test and monitor your temps. Also run a gpu stress test and monitor those temps also.

  2. I've tested both prime95 and intel burn test the cpu is stable and my temps are good.
    It's not that sadly ;_;
  3. Have you stress tested your gpu? Furmark and/or ati tray tools are pretty good.

  4. Yes I've tried anything but i can't force the error.
  5. Intermittent errors are a pain.

    I know you will lose frame rate, etc, but have you tried removing the 7870 and running off the igpu?
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