After power failure, computer will not start up?
After recent power failure, Imac will not stat up. No sound or any indications. Tried unplugging power cord and re-plugging power cord and depressing the on switch for 10 - 15 seconds, no response. Tried powering from another AC power outlet, no response. Appears power supply has failed. I am prepared to replace power supply but could the problem be something else?