Power supply Video (on board) no discoloration, caps are fine, power was taken out and taken apart, fine, Processor fine. Discoloration found on the back USB module, looks as if something flashed (lint maybe?) Still the same results. I have a jpeg of the rear where this occured, I can send it to You if it will help clarify anything. Thanks.
So far only the USB -- did the failure coincide with plugging something in ?
I doubt if lint would be a problem with only 5 volts.
I have seen a computer which had failed where the pins on the front panel USB had been damaged (presumably by someone forcing a plug into the socket). Possibly USB was the cause -- I disconnected the USB socket and replaced the power supply and that fixed it.
Tested every component utilizing every variation and still no positive results. Tested power, PC Chip, memory, modem, dvd drive on another machine, they all work. Purchasing another Mother Board. Thanks.