Hi guys, I need some help here. Until yesterday, my iMac G3 slot is working fine, but today, I can't power it up. When I press the power button, the light just flash and then went off. I've opened it up to check the PRAM batt and also checked if there are any shorts on the logic board. All looked ok to me. The HDD is working fine and I supposed the power supply unit is fine too. Please help and advice on this. Thanx!!