So I have searched the internets for a problem like mine, but haven't come across it. I last started my computer in August of 2008 (bought a MBP) and now am trying to sell this one and had a large problem: I plugged it in, all the peripherals and everything and booted, the light came on, the power supply fan went on and then the obscenely loud cooling fan came on but nothing came up on the display. I thought it was a display issue and checked and replaced all the cables and used a different display. Now when i turn it on the power supply fan comes on, the main fan comes on but no light. the light comes on when i press and hold it but as soon as it is released it fades out. the little red light on the motherboard is on however I took out all my PCI cards and unplugged everything from the mac, i followed instructions on apple.com to reset that button on the motherboard. Im not sure what else to do. I would put specs up here but i have no idea what they are, haven't used this computer in years.