Computer Keeps Shutting doen and monitor says no signal

I have an e-machine c2280 with a GeForce FX 5500 GFX card. Every time I power on the computer it stays on for about 2 minutes and then shuts down. Also the monitor says No signal. What could the problem be
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More about computer shutting doen monitor signal
  1. Graphics card is probably overheating, try cleaning the fan, sorry to say e-machines and FX cards are at the low end of the technology and reliability ladder.
  2. Something shutting down on thermal overload. Download HWMonitor and start on bootup watch temps.

    Blow out all dust from case, GFX card housing and CPU HS
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