A good way to tell is disconnect your hard drive's, & CD/DVD ROM's power & data cable. Try to boot.
If you get the same results then you can try & remove any PCI cards from the board, remove your ram stick. Try to boot. If you get an error beep because you are missing ram than this is good.
Replace 1 ram stick back into your motherboard & try again. If it boots then you know the other stick is bad.
If removing all the non-essentials from your motherboard doesn't work then all you have left are the motherboard & power supply. A simply power supply tester or spare power supply will tell you if it is your board or not.
SOURCE: T2958 motherboard connections
Concerning the pin locations and polarity they are printed on the motherboard close to the pins. Also, your power supply is failing. I have a customer with the same problem, the power supply needed to be replaced and also the motherboard because it would not even boot to post.
SOURCE: Where can I get a replacement motherboard for emachine T2984?
Here is a site where you can buy one for a relatively good price....hope it works out.
SOURCE: emachine t3958
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.
SOURCE: eMachine T2482 Computer won't power on or boot up.
Check the power connection physically make sure that it is connected properly, try other power outlets, if still nothing happen? the problem is on the power supply of the computer, you might replace it. it think there's no switch on the mother board.
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