I turned it off from the light switch on my wall bye accident now i have NO power at all nothing happens when i hit the power button i opended the tower there is a little green light that stays on while the pc is plugged in other then that NO power at all.
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Are you saying you bought 2 more machines to fix the problem? I don't understand. Do you have the manual for the machine. How long did your system run before a Ram stick went bad? What brand and size are your Ram sticks. Are they identicle? As far as Clearing BIOS, your manual should show you the jumper position to do this, which you will leave in this ( drain ) position for a minute. Powering up from here you need to immediately hit a key to send you to BIOS most are <del> or F10 or alt esc. You must look in your manual for this and then all your boards should work. If you need my help in finding your manual, give me all numbers pertaining to your machine.
First check to see if a drive died. Unplug all the drive Floppy, hard and dvd or burns. I have come across many time that a drive will die and keep motherboard from booting. Being that you say you get a green light on the motherboard shows that the power suppy is providing some power. But for some reason the internal self test is faulting the power suppy. I have not come cross any bad power supplies killing a motherboard. But I have come across power supplies killing drives. The power switch is a normal open switch so the only time you be able test continuity on it is if you hold the switch in, or the closed position.