Your problem is either with your power supply or motherboard, but being as it boots somtimes and then dosent, and not even a beep, then the power supply would be the main cause, i sugest taking the power supply out of the computer and taking it to your local pc store, ask them if they could test it for you before you buy a new one. hope this helps.
Agree, the power supply is bad . Its very easy to change and Acer uses a universal design power supply you can get at Fry's or Comp USA. Get at least a 400 watt. Take your old one with you to match the physical size to be on the safe side. If you can use a screwdriver, you can do this yourself.
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