Computer (HP Touchsmart 300) shuts down after 15 or so minutes. Like someone pulled the power cord, Will not restart unless power cord is pulled out and put back in. I can see a steady green blinking light on the motherboard through the heat vent.

My hp touch-smart 300-1125uk wont turn nothing moves, not even the fun. when i plugged in the ac cord i see a green light beside where i plugged in ac cord. but immediately i press the power button the green light goes off. unless i pull it out again and Waite for about 30 seconds then the green light comes back again. please i need help

Hi

By any chance does your power supply have an on/off rocker switch on the back? Is it on? I don't mean a red voltage adjustment switch, however. If that isn't it, do you have access to another power supply to install and test? As unlikely and coincidental as it might seem, perhaps the power supply is the problem and needs replacement.

Pull off the main 20/24 pin motherboard power connector then using a small wire or a paper clip connect the green wire with one of the black wires on the 20/24 pin plug, the psu should fire up and the drives will spin up, if not then the psu is dead. When you do this test there needs to be at least one hdd/odd connected to the psu since most psus have minimum load requirements to run.
Some PSUs have a rocker switch on the back that cuts the power, be sure to check that out too.

Check this helpful link to test the PSU:-

http://pcsupport.about.com/od/toolsofthetrade/f/powersupplytest.htm

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