A friend brought me his pc to fix. It is an HP pavillion a604x. Won't power up at all. There is a flashing green light on the back of the PSU. So, first things first, I unhooked everything from the MB. floppy, cdrom, HDD, all Cards, re set the memory. Still nothing. So I unhooked the PSU and tested it by shorting the 14 pin to a ground wire. Dead. I replaced it with a working PSU, still not powering up the MB. Then I bypassed the power button, shorting the MB power up pins, no change.
So its not the new PSU, or the drives. Has to be either the CPU or the MB, right?
Found a MB on Ebay for $56, anything else to try before I buy it?