Is my PSU dying?

[zizinator]

My PSU or my GPU is dying. I need help to decide which one.
The specs are:
i5-3570K
Msi Z77A-G45
Radeon 7870
Corsair XMS 3 16 Gb.
OCZ Agility 3 120 Gb.
Seagate Barracuda 1 Tb.
Antec TruePower 750 Watts

My computer randomly shut off and when I pressed the power button, it wouldn't turn on. I then continued to remove a component until it turned on. I found out that if I removed my Radeon 7870 , the power supply was willing to cooperate and actually turned on. Currently, I am running on integrated graphics and need to get my whole build back together.

If anyone could help out in deciding which one is the source of the problem, I would be very thankful.

If it does end up being a PSU problem, I would like to have some recommendations on which power supplies are good. This is my 3rd failed Antec and would like it from a different brand. Preferrably Seasonic or Corsair.

 

[clutchc]

Hard to say w/o another card or PSU to swap out. But that is a symptom of a failing PSU. Have you tried the card with other available PCIe power connectors to rule out a bad cable/connector or rail?

 

[DeViL5o5]

Seasonic and Corsair are good brands. You can also try testing your GPU on another system. And like clutchc says, it is definitely a symptom of a failing psu. it may no longer be providing enough power for your whole system.