When I power my pc on, the green light around the power button lights up, I can hear the computer running, but my screen is black. I checked my screen with another computer and it's working fine, I did notice that the yellow light that has a battery symbol above it on my pc is not lighting up, could this be my problem and how do I fix this? also, when I opened my pc up I noticed there's a red, black & white wire that has a 4 pin connector on the end of it is unplugged from somewheres and I don't know where it should be plugged in at. Any advise????
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sounds like an issue with your motherboard or something like that...try resetting the motherboard by unplugging the power, taking out the battery of the motherboard inside the computer and pressing the power button several times to drain the power. then put the battery back in, plug in the power cord and try to start it up. if it doesnt work then ur gonna have to contact emachines because ur mobo is either defective or broken...
your getting power to your PSU, via the green light on your mobo.
verify the PSU has a green light(most emachines do)
it sort of sounds stupid but, check the connection of the cable coming from the front of the case(the wires that connect to the mobo to the power button on the outside of the case.
if all else fails, take the pc out of the case.. put all components on a static free bag and start to rebuild your PC(without a case)
...this will rule out a short on the PC case, and faulty wiring from the case...
pretty much sounds like you've been through almost every step except replacing the PSU(you just said you tested/but your getting power to the PSU)
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.
Take the battery out and unplug the power cord. Press down the power button continuously for a solid 30 seconds without stopping. This drains all the power out of the circuits and resets whatever invalid state your computer is in.
Now, leave the battery out but plug in the AC and turn on the laptop. If it works, turn it off again and insert the battery. All should be well.
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.