Computer shuts down while playing games

Earlier today I made a thread about this already and people suggested that I dust my pc out. That is what I did and my pc stopped shutting down until now. Now it started happening again. It shuts down the moment I enter the game or after I play for a while. The temperatures are normal, I checked them. The cpu around 60°C and the gpu a bit below 70°C. So since I just dusted my pc out and the temperatures are normal, its not an overheating problem and I am guessing that something is broken. I tested my ram, cpu and gpu a while ago with all kinds of stress tests and everything worked fine. People told me that it might be the psu. What do you guys think?

My specs:
Windows 7
4Gb DDR2 Ram
Intel Core 2 Quad
ATI Radeon HD4890
750W PSU

Update: I just enabled System fan 1 fail warning, Power fan fail warning and System fan 2 fail warning in bios and it beeped all 3 times, so does that mean that those 3 fans are the problem?
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More about computer shuts playing games
  1. Most PC shutdown to prevent parts from getting damaged. Your temps might be too high.

    You suggested your PSU as a possible issue, what brand and model is it?
  2. MrGamingdwarf said:
    Most PC shutdown to prevent parts from getting damaged. Your temps might be too high.

    You suggested your PSU as a possible issue, what brand and model is it?

    To be honest I dont know the brand and model of the psu, as I did not build the pc myself, but simply bought one. So it is probably one of those cheap ones.
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