First try dumping the cmos. Unplug the AC power, remove the battery, open the memory compartment. To the left you will see two wires, a red and a black, running to a little plastic connector ( the other end connects to the cmos battery) just unplug the little connecter, let it sit that way for 1/2 hour or more, reconnect the cmos battery plug in, put back battery and/or AC plug, and try retarting. If nothing, then replace the cmos battery.
Earl Dunham
July 2007