Guild Wars 2

My husband’s comp has had an issue for over a month now. In game, get a black screen. Then the monitor says no signal. The sound lingers for a couple seconds then turns off. Fans turn on higher, and comp stays running. No crash.dmp, no log, no event on the event logs, no computer crash log. Nothing showing a problem. Have to hard boot the comp to get out of this state.

Comp is an HP h8-1214 with a new psu (850w),
12Gb RAM,
AMD FX-6100 six core processor
AMD Raedon HD 7770 GPU
Logitech G600 Mouse
Win 7 x64. home premium SP1
Liquid cooling on CPU

Have tried: Anet support (reached the stage where they said reinstall OS)
Swapped graphics card with another of the same type (on my comp)
Repaired game
Reinstalled game
Took to a repair shop (they underclocked the gpu so badly it was unusable)
Tested the RAM
Tested the PSU
Reformatted and reinstalled everything.

Still doing it. Our next step is a new MOBO, CPU, and GPU. (again for GPU). Any suggestions that may just fix this? Permanently? And still leave us with a good comp? I’m on disability, he doesn’t make lots, we can’t really afford this.

Swap your power supply into his computer as a test.

The only way you could have properly tested the power supply is with a load tester and you would also need to monitor the switching noise with an oscilloscope.

The above test will either show that the failure is not the power supply or confirm that it is.

Edited to add: I didn’t notice that the PSU is new. Was it replaced before this problem started or after?

PSU was replaced at purchase of the comp. Took out the PSU and took it to a computer repair shop. THEY said it was tested and was fine. Just ordered a new MOBO and CPU. Hopefully this fixes the problem.