Replaced psu. stndby lght on motherboard blinks with original psu and stays lit with new psu but still no power. the tower shut off in the middle of working one day. i tryed to turn tower back on and the power "E" button would blink as i held it in and the fans would click on. as soon as i releaseed the power"E" button everything stopped. After doing this a few times the tower would not respond at all to me pressing the power button.
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Re: emachine t5026 not power on. replaced psu.
I would test the memory. Also I think some computers will shut down if the fan on top of the CPU quits working. Or maybe one of the other fans or the Hard Drive quit and is drawing too much juice causing the PSU to shut down. It sounds like something may be grounding.
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Usually the light will time out after the capacitor has drained. Your machine is getting a bit old , your PSU may be the problem. If you plug it in and push the on/off button and it blinks, fans spin and shuts down, it's most likely the PSU. Look for a in-line fuse on the Motherboard, if blown, replace. Look at the motherboard closely for damaged components, capacitors, etc.
If there is no sign of life, then it is usually a power supply problem. Check PSU connector. If PSU fan does not turn on check the power cable. If power cable is good, test power from PSU using a multimeter and eventually replace PSU.
Even if those things power up doesn't mean your PSU is still good. In particular the PSU in eMachines are known to be cheap/bad and one of the first things to go out.
If you have access to one try another ATX power supply. You don't have to remove the old one just to test.
1) Unplug the existing PSU power cable from the back. 2) Remove all it's connections (MB, drives, etc). 3) Plug the other PSU in with just the two MB connections (the main, and 12v one), skipping any drives for now. It's probably ok if the test one is not touching, but I like to put the PC on the side with the test PSU setting on top where the original one is making sure it has good contact with the case to make sure it's grounded. 4) Now plug the AC into the test PSU and power it up.
If it still dosn't power up it's probably MB, or CPU. You could also unplug it again (you always want to unplug the PSU when doing anything, the power is always on), and try removing any add on cards (like your wireless card), and try again.
If it does power up (you get a POST screen), unplug PSU again, now plug-in drives, then AC back and see if it will boot up.
I would try to replace the PSU and see if that makes your computer boot. Do like a guess and check. If its not the PSU, maybe try a new motherboard. Does the computer not boot, or does it beep when turned on? I hope this helps solve your problem