GPU suddenly causing computer to not boot

[YoshiHDify]

Hey guys,

 

I've got a computer with a HP Pavilion desktop tower with i5-750.

I upgraded over the years:

- extra RAM

- SSD

- GTX 560 Ti

- AYWUN 550w 80 Plus PSU

 

Today it suddenly shut down and won't start, so I assumed the PSU died.

After checking unplugging the pci-e connector (just one sometimes works but both definitely works), it boots. (But with the gpu still in the motherboard it makes beeping sound, probably because it's being underpowered.)

Also the shorting pins method shows the PSU did intact still ran. So now i'm thinking this old generic PSU must be degrading.

I swap in my Silverstone 600W 80 plus bronze which I had running a 7870 and it's the same scenario.

Also just for the giggles I even used a SHAW 865w??? $20 PSU with adapters on the GPU and it still does the same thing.

What is going on??

 

Is 600W PSU still not enough for this ageing 560 Ti and i5 or am I missing something here?

 

I even ran dual PSU, one just to power the motherboard + aux 4 pin and another just to run the 2 6 pin pci-e for the gpu. No luck.

[Enderman]

600W is more than enough. When you say it wont start, are you able to get into the BIOS or do you just get a black screen at boot?

You might need to reset your CMOS.

[YoshiHDify]

600W is more than enough. When you say it wont start, are you able to get into the BIOS or do you just get a black screen at boot?

You might need to reset your CMOS.

 

When power button pressed (or short circuit)  The power supply fan jolts a tiny bit, and nothing happens.

[spy_magnum]

Try placing your GPU in another system. If your GPU works in another system its propably your motherboard that causes the problem!

[Enderman]

When power button pressed (or short circuit)  The power supply fan jolts a tiny bit, and nothing happens.

This seems to be a problem with your motherboard or GPU.

Try either replacing the GPU or replacing the mobo and see what works...

[YoshiHDify]

I swapped in my 7870 and it runs. What's actually wrong with the GPU though :\

 

It beeps with no pci-e and with just one 6 pin. and it totally stops the system from booting with 2 plugged in :\