green led means it receiving 5v standby.
Unlikely to be CPU as just took mine out on my old P4 and still fires up.
Last time I went a independent computer shop to check out my components cost me £30 couple of years ago, so is not cheap. Turned out I'd had probably managed to crack the board when installing
but back on topic.
As it's not PSU, then I'm thinking:
something maybe shorting the computer out
one of the jumpers on the board may be preventing it from switching on
board has stopped working
1. Sorry to say this again but, use pen to short (touch) these 2 pins on board:

Sorry picture isn't too big. Board should be similar in layout if not exactly the same.
If that works then that definitely means you've got a problem with the switch on the case.
If not then can you check the following:

the little jumper thing should be over pins 1 & 2, i.e. the left 2 pins. If not then lift up jumper and place over the left 2 pins, know that may be tricky due to location. If already over the left 2 pins then leave it there.
might have something earthing the case but can't see it somehow.
Other than that


*edit* just found this on google search: emachines won't boot
Similar to yours by the sounds of it
Unlikely to be CPU as just took mine out on my old P4 and still fires up.
Last time I went a independent computer shop to check out my components cost me £30 couple of years ago, so is not cheap. Turned out I'd had probably managed to crack the board when installing
but back on topic.
As it's not PSU, then I'm thinking:
something maybe shorting the computer out
one of the jumpers on the board may be preventing it from switching on
board has stopped working
1. Sorry to say this again but, use pen to short (touch) these 2 pins on board:

Sorry picture isn't too big. Board should be similar in layout if not exactly the same.
If that works then that definitely means you've got a problem with the switch on the case.
If not then can you check the following:

the little jumper thing should be over pins 1 & 2, i.e. the left 2 pins. If not then lift up jumper and place over the left 2 pins, know that may be tricky due to location. If already over the left 2 pins then leave it there.
might have something earthing the case but can't see it somehow.
Other than that



*edit* just found this on google search: emachines won't boot
Similar to yours by the sounds of it

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