Mac Mini shutting off soon after turning power on

Hi,
My Mac Mini was working fine last night, then when I tried to turn it on this morning, the fan was making a lot more noise than it usually does, and the LED light was flashing bright every second or so. The Mini booted up into the login screen, then suddenly turned off as I tried to sign in. I have restarted the PMU, and tried to run the install disk but the computer shuts off on me before it has a chance to load it. It seems that if I put the computer to sleep at the login screen, I am able to log in and see my desktop before the Mini shuts down again.
Can anybody help me?

It sounds like your logic board may need to be replaced if the PMU reset doesn't work. Some component is probably overheating or changing value causing it to shut down.
-Bmer
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Mac Mini shutting off soon after turning power on

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