I have a 4 year old computer, but with some new parts. Some time ago I started having problems starting it up, but when I took out the power cord and replaced it and then turned it on in the back, follwed by the front it would start. This worked for a few months but now when I do this it just blinks, once, at the front but it doesnt start. To get it to blink again I have to take out the power cord and do the process again, but as before it just blinks and dont start. I sent in the power pack but the firm I bought the PC from said it works fine. Anyone have an idea what could be wrong? Also, nothing happens but the one time blink a the start button in the front. No fan or anything.