HELP! G5 not booting! red light turns on in the processor area

hi,
i have a dual 2.5ghz g5 and for a couple of days it's been acting weird. when i try to boot i hear the chime and before it finishes, it abruptly mutes and a red light goes on in the upper part of the processors area. I have seen through the side of the computer that the light is somewhere close to the processors. The computer does not continue booting, it just remains with the red light on and the fans working at normal speed.
At first it happened one time (yesterday) and then it worked normally. Now it won't work at all, even after letting it rest for a couple of hours.
Does anyone know what that light means? I hadn't seen it before. Could it be that the processor is running too hot? I live in a hot area and there's been a hot wave these days. It's reaching 87 F degrees inside but I believe that's within the correct operating temp. range.
Any help will be appreciated, and the fastest you can answer the better because i really need that computer!!
I hope it's nothing serious that require taking it to repair because I don't live near any repair service. Please help me!
thanks in advance!
dual 2.5 Ghz Power Mac G5 Mac OS X (10.4.8)

I don't think it is a heat related issue. I've got the same problem with a dual 2.7GHz G5 that's operating in a temperature controlled machine room. Or if it is a heat related issue, it's not an environmental temp problem, but some failing component.
I ran Hardware Test on it and it indicates that everything is fine with it, but as soon as it is rebooted, it does that half chime and then nothing. No status lights on the logic board either.
Once it's on, it seems to stay operating just fine. shrug
Dual 2.7GHz PowerMac G5 Mac OS X (10.4.8)

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HELP! G5 not booting! red light turns on in the processor area

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