G5 fans run fast and computer won't boot

I have a dual core G5 that will not boot. The screen remains black and the fans seem to run awfully fast. Once the Mac powers up, the power light goes out. I also noticed a red light on the motherboard, just behind the power switch. Any idea what the problem is, or how serious?

There should be one red LED lit...
LED 1—CPU A:  red—contact Apple or an Apple Authorized Service Provider
LED 2—Overtemp:  red—contact Apple or an Apple Authorized Service Provider
LED 3—Power On:  red—the main power is on
LED 4—Trickle:  yellow—Power Mac G5 is plugged into the wall correctly
LED 5—Open Firmware good:  green—no problem
LED 6—CPU B:  red—contact Apple or an Apple Authorized Service Provider
LED 7—Checkstop:  red—contact Apple or an Apple Authorized Service Provider

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