Display keeps turning off for a second or so

A few days ago, I made a thread about my hdd trouble and it turns out it's almost done for. I'm resigned that I'll have to get a new one, but for now, I'm still using it as much as possible.

But now a new problem has emerged. Display just keeps randomly turning off, most notably when I'm switching tabs in Chrome, using flash player or just putting my PC under strain. Any kind of processing seems to render my display useless for a second or so. Does this mean that my video card is also dying?

Video card in question is Radeon 5750HD 512MB.

Also, I'd like to point out that both these problems have occured when I temporarily switched my power supply, going from 550W to 400W.
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  1. Best answer
    That definitely sounds like a problem with the GPU. Your first port of call should be to do a clean reinstall of your graphics drivers and see if that fixes the problem.
  2. Tried installing the newest beta driver over the old one and it did not resolve the issue. At this point, every time I switch a tab or scroll down or basically give orders to VG to display anything new, it turns of for a second or two, sometimes up to 5 seconds approximately. This is probably related to my hard drive, right? I'm not sure how it all works, but I assume that it's a memory issue.
  3. Are you still using the 400W power supply? If not and its still happening then look at what benjii says
  4. What's the rest of your system specs? 400w isn't a lot.
  5. Phenom 9750 X4 2.4GHz
    2GB 1066MHz

    So if the driver didn't fix this, a better power supply could? I'd like to point out that this configuration along with the video card mentioned above worked just fine on this 400W no name power supply. This problem occurred randomly, but it did occur shorty after my HDD started failing.

    I'd also like to point out that this problem seems to be very variable. At this moment right now, it works alright, it still turns off occasionally, but it's nowhere nearly as bad as it was an hour ago or so, where it would go off every 3-4 seconds or so.
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