Screen flashes black every 90 seconds or so while playing certain games?

I set up my PC several days ago (HP DC5800 SFF w/ Radeon HD 5450 graphics card), and I've been having an issue while playing certain games; the screen flickers black about every 90 seconds, give or take a bit. It only lasts about as long as the blink of an eye, and of the games that I've tried, I've experienced it while playing Burnout Paradise, Fuel, and Tony Hawk's Pro Skater 2, however, I have not experienced it while playing Bioshock, Trackmania Nations Forever, or Tomb Raider Anniversary.

I've tried just about everything I can think of to remedy this, including underclocking, changing refresh rates, changing resolutions, lowering graphical qualities, changing video cables, monitoring the temperature of the graphics card, and other things I'm sure I'm forgetting, all to no avail. Anybody have any idea what could be causing this, or at least possibly recommend any other actions I can take to try to fix it? The issue itself isn't a huge annoyance, I'm just worried that there may be an underlying issue with the card. As a side note, the card does get up to about 72 degrees celsius under load, and it idles around 50; is that too hot for an HD 5450?
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  1. Best answer
    Might be a weak PSU, Hp tends to go as cheap as possible on the PSU so if you do want to add anything you come to them for upgrades (at outrageous prices)
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