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5 year old unit became intermittent in the last few months. After a commercial power failure the unit would no longer reboot ( power on) I replaced the CMOS battery, thinking that was the problem. After attaching the power plug, only the LED on the power button seems alive. There is never any video output. The five volt signal on the internal connector is not present. Attempting to restore the BIOS does not work, as pushing the power button just powers the unit down. About one in 20 tries, the internal 5 volt, and the fan are operable.