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pull out everything in the computer except what's required to boot...so any pci cards or video cards (if you have onboard video). you can also try pulling out the ram (while unpowered AND unplugged) and then booting to hear beeps...if you pull the ram out and the computer doesnt make a sound, its probably a bad motherboard and needs to be replaced. if you hear beeps, try replacing the ram or disconnecting other parts...like harddrives, optical drives, modems and what not.
A Blinking Amber or Yellow power button means that the power supply is receiving power from the source but is unable to properly distribute it to the components. This can be caused by a defective power supply or a defective motherboard. Power supply is easier and cheaper to replace. Your responses are intended to improve the level of service provided. Please show your appreciation by rating your experience. Thank You.
It could be that your motherboard might be dead. Do you plug your pc into a surge protector, as sometimes there could be a surge of power that could blow circuits on the mobo. Did your computer BEEP at you. I know that sounds daft but all pc do a post b4 booting and if there is a problem the computer BEEPs, not exaclty handy as it tells you there is a prob, but not what it is. Is the pc still under warranty. If it is then go to makers site and ask the tech guys there. If not, are you competent to take pc apart and check the internal components. It could be something simple to fix, like a loose processor fan, power couplings coming loose, or possibly your RAM has blown.
if you can supply any more details than whats in your post it would help out alot.
when you say "the fan makes a noise like its getting ready to spin", which fan...power supply's or cpu? if you answer power supply, then the POWER OK signal is not returning to power supply and it then quickly shuts down to prevent further damage. double check a firm connection to mother board.
If you answer CPU, then it becomes far more complicated. Try re-seating the memory chips.