Upgraded PSU, PC still shutting down by itself while using TV as display

Last week I posted a thread explaining that my computer would shut off after about 10 minutes of playing StarCraft 2 on my TV. I found out that my power supply was rated at 250 watts while my video card needed 450. I got a 520W power supply, but the same thing is happening. Is it because I have the monitor AND TV displaying the game simultaneously? Would shutting off my monitor prevent the shut down?

I hav an ATI Radeon HD 5750 and an Antec 520W PSU.

Does it shut down normally, or does it just cut out and go dark? If it shuts down in what appears to be a normal fashion, it might be some sort of overheating prevention feature kicking in.

Does it shut down normally, or does it just cut out and go dark? If it shuts down in what appears to be a normal fashion, it might be some sort of overheating prevention feature kicking in.

matte3560

[QUOTE="matte3560"]

Does it shut down normally, or does it just cut out and go dark? If it shuts down in what appears to be a normal fashion, it might be some sort of overheating prevention feature kicking in.

creeping-deth87

[QUOTE="matte3560"]

Does it shut down normally, or does it just cut out and go dark? If it shuts down in what appears to be a normal fashion, it might be some sort of overheating prevention feature kicking in.

creeping-deth87

From the little information we have, it sounds like the video card is failing. Check its temps, and if it is heating fast (65+ from idle) and shutting down, try cooling the case, if you see artifacts, which are lines and strange occurrences on the screen, you are having a failure.

A couple of years ago, I tried hooking it up the the TV and my PC shut down. In my case, the GPU overheated. My GPU was SCORCHING HOT. Too hot to touch, too hot to handle.

A couple of years ago, I tried hooking it up the the TV and my PC shut down. In my case, the GPU overheated. My GPU was SCORCHING HOT. Too hot to touch, too hot to handle.

Elann2008