Gpu fans start for 2 sec and stop on startup. "No display" on monitor and no power to keyboard and mouse

[Warmog]

So lately i was having a problem, my pc woudnt turn on and the monitor showed "no display" and the mouse and keyboard light stayed off. The rest of the pc was normal (fans and LED working normally)
I would need to keep turning it 2-3 times before working
However recently i realized that everytime this problem happens, when the pc starts the gpu fans run for 3 sec and then turns off imemdiatly and the pc seems to fail more and more lately.
If it boots up, my PC is completly normal when i use it idle or for minor tasks and can use it all day (once it even kept running idle for 72h), however, under load while gaming, sometimes after 3h and sometimes after 20min or so (i swear it seems random), my screen kinda crashes suddenly to a black screen and the screen goes "no display" again With no sound coming from speakers.
When i force shutdown my PC its back to problem n°1

Idk if its the PSU or the GPU dying or maybe a dust problem ?
My build if it helps :

CPU : ryzen 5 2600X
GPU : Zotac Nvidia Rtx 2060
Mobo : MSI B450M-A Pro Max
Ram : T force Delta RGB 2x8 Go 3200 Mhz
PSU : Nox Urano VX 650W 80 Bronze +
Storage : WD HDD 500Go + Pny SSD 240 Go + Pny SSD 500 go

Update : I was told the problem might be my GPU dying or overheating but i managed somehow to turn on my pc and ran a benchmark and everything was good and nothing seemed wrong
Cpu (idle) : 30°C
CPU (full load): 45°C
GPU (idle) : 30°C
GPU (full load) : 69°C

 

[pavle]

Looks like a graphics card issue, but test with another PSU if you can. You can also measure your PSU power lines with a multimeter if you are up to it (3.3 [orange], 5 [red] and 12V [yellow wire]) to see if voltages are in spec.

 

[Warmog]

Looks like a graphics card issue, but test with another PSU if you can. You can also measure your PSU power lines with a multimeter if you are up to it (3.3 [orange], 5 [red] and 12V [yellow wire]) to see if voltages are in spec.

I ran multiple benchmarks (3D mark demo / Heaven / Superposition ) and even Furmark for 1h and nothing happened, no crash no anything, everything seemed completly normal.
However i still have the same issue when i shut off the computer and i want to power it on : black screen and gpu is off and it seems like it wants to start up at random.
When i finally managed to turn it on i played for like 1h and the pc crashed again

 

[RJARRRPCGP]

Suspected:

Bad caps in the PSU and/or motherboard failure.