Just wait until you get the new video card and CPU in it. If you're still having same problems, then it really might be a dieing PSU. My guess is that the video card is dieing and drawing excessive power and overheating PSU as soon as you run anything graphic.
Have you installed a CPU before? Make sure you use thermal compound on the top between the heatsink/fan and the CPU.
Have you installed a CPU before? Make sure you use thermal compound on the top between the heatsink/fan and the CPU.
