Question No signal from gpu

[tomktom3]

Hello!

Under load my GPU turns off and the screen goes blank then "no signal", sometimes "out of range" appears but the computer itself remains on since i can hear windows sound effects, or music i just cant see anything.
What i tried:

• removed gpu and switched to integrated graphics (intel hd 530), still the same issue, but not as frequently. It happens mostly during alt-tabbing or when applications start in fullscreen mode or when the screen resolution changes
• completely removed and reinstalled nvidia drivers, 2 different versions
• reseating CPU and new thermal paste
• reseated/removed RAM
• cleaned PC, GPU and power supply
• DVI instead of HDMI cable
• different monitor
• different PCI slot for GPU
• different PSU cable, both the 8 pin one that goes into the GPU and the large one, that goes into the wall outlet
• bios factory settings reset
• bios voltages are okay
• changed fan speed to higher and lower rpm
• updated windows
• safe mode

What i did not try:

• different power supply and GPU (dont have)
• reinstalling windows 10

None of these seemed to fix my issue, my PC is not overheating, the GPU does not go above 80°C and the CPU is around 45°C under load, and the idle temps are much lower. It first happened a few weeks after reinstalling windows due to a faulty hard drive, but it never happened before. I'm mainly using AutoCAD, Blender, office applications and games when the issue happens. Sometimes the graphics card shuts off immediately when i launch a program that uses GPU, and sometimes i can run benchmarks for an hour before anything happens. I bought this PC in 2015 and only had the motherboard replaced around a year ago, to a same board, only with newer bios version. What could be the issue? I was guessing the GPU, but since it also happens with integrated graphics, could my power supply or motherboard be faulty?
Specs:

• ASRock z170m motherboard
• Intel core i5-6600k (not overclocked)
• GTX 960 4GB
• 16 GB DDR4 kingston memory (2x8 GB in dual channel)
• 750W EVGA PSU
• 1 TB Toshiba HDD / no SSD
• Windows 10 64bit

Thank you for reading!

 

[Vic 40]

Which psu exactly? =model

Was thinking about motherboard since gpu doesn't seem to matter. Tried a different pcie slot? If you have a second one that is.

 

[tomktom3]

It's an EVGA NEX750B 750W Bronze (110-B1-0750-V2) psu.

I tried 3 different pcie slots, none of them fixed the issue.

 

[Vic 40]

Anyway you can test with another psu? Maybe a friend or local shop can help you out ...