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15 inch "Desk Lamp" iMac G4 700MHz M6498 PowerMac 4,2

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When powered on, fan spins loudly but no sounds

When I hit the power button on the computer nothing happens, other than the fan spinning up loudly. No other lights, and the monitor don't turn on. Can somebody please lend some insight? I just ordered a new pram battery as per some other answers I've read. I was thinking of replacing the logic board but want to know if anybody has anything else I can try out first. Also, can somebody please tell me how to disconnect the "TMDS video connector"? I don't want to break anything :s I've included a picture of the cable I'm talking about, in case I'm not referring to it correctly.

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The connector has a plastic U shaped cover over it. There's a sticky strip on one side. It will pop off if you wedge a small flathead under the edge. Unplug the machine and all peripherals and hold down the power on button for 10 seconds, then plug it back in and try to start. If this fails, wait for the PRAM battery.

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Awesome, thank you very much for your help! Holding the power button didn't seem to work, however. I'll let you know if the new battery fixes it. Thanks alot!

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Armando will be eternally grateful.
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