My emachine d485gvdr board: 40001326-00765 (EM) 148886 TGSR42911715 AA C74803-201 Pwr supply deffective (5Vsby to high at around 12V) caused the mb to die, not producing the PS_ON# signal (active low) to turn on pwsu.

Check the various voltages coming from the power supply board and see if they are all ok, there is a legend on the power supply board to show what voltages are at what pins on the connectors,the 5 volt standby we know is good as long as the set has sound, but check the others

i dealt with this sort of problem with emachines, end result is i had to replace the board.

Also, the only other thing that could cause your system not to boot is bad power supply, fried surge protector, electricity not going to outlet, try a different cable from monitor or printer and try, a bad cable from power supply to board or you totally fried the board CPU dead...

hi,
Issue seems with the power IC of the motherboard need to repair.

You should be able to see the words/letters that go with the jumpers on the motherboard itself. look around the jumper settings area for power, pwr etc. and match them up with your jumpers which should have what the go to on them.

Bottom line: Either your power supply or (hopefully not) the mother board has gone bad.
Replace power supply (remove old one), take to local independent computer shop, ask them for new unit. Should be around $50.00. - no more. After reinstall, if still no fans, boot, etc. Replace motherboard or buy a new machine. MB's installed probably will run you around $250.00-ish.
Good luck.

gurutim

Depending on your processor type and speed as well as ram, to save you a headache go to http://pricewatch.com and order a new motherboard with warranty, cd and manual.

Emachines have notoriously cheap power supplies. Often, while the power supply itself doesn't fail, it causes the failure of motherboard components, essentially trashing the computer.

Try the following:

First check and make absolutely certain that the power switch connector is properly connected to the motherboard. (Take standard grounding/safety precautions: wear a properly-grounded grounding strap, for example, when working with any internal components.)

Obtain a known-good power supply of equal or greater capacity to your eMachines PS and switch 'em out. 

If either of these fixes your problem, well and good. If not, the problem may be, as is all too common with eMachines power issues, a motherboard issue caused by the power supply.

The diagram for that 9 pin J9G1 is alongside the CMOS battery.

i have been to fic's web site, i cannot find any mb labeled au31.

do you have anymore information about the board, how old, which processor, what socket, which north bridge, south bridge, which model system, etc?

 

however the pins are usually marked "pwr sw" or "pwr" and are usually with all the other front panel connector pins.