Intel iMac  snow leopard, light flashes on and off 4-5  times

Light flashes on and off 4-5 times, then the flat dull beep, then the chime, will not boot up after that...
thoughts
Appreciate any help

Hi having the same problem with iMac 17 isight. Will not startup and only the white light flashes on and off. No sound. Removed front cover and tried start and same results, but I could see that the fans would sort of shake as the light flashed. Tried replacing the power supply and the same results. Can't us the AHS application, because the computer can't startup. Anyone with an idea?
Thanks
Tsofa

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