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Computer won't "turn on"

1553 Views 5 Replies 3 Participants Last post by  Danster, 
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Hey guys - I've never seen this happen to one of my computers so I am looking for thoughts.

I was away on business for 3 weeks so I turned my desktop computer off. I came home and turned it on and nothing happened. There is no noise, nothing.

I have unplugged the power cable and made sure the rocker switch is set to on.

When I push the power button I can see a "green light" on the mother board comes on but there is no noise. If I push the power button, and hold it, the green light on the board goes off.

Any idea what the problem is? Is it likely a dead power supply? Dead mother board?

As far as I know, it was not hit by lightning. I have several other things plugged in to the same power bar (surge protected) and they all work fine.

Since I see the green light, I am thinking that some minimal power must be getting to it but I don't know if it could be some residual power inside the computer that is just enough to turn on the light.

Thoughts?
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How handy are you with a multimeter? If you unplug one of the molex connectors, and insert he black lead in the hole with a black cable and the red lead in either the yellow or red hole, you should get 5 or 12 volts.

One thing that baffles me, you can press the power button but not much happens? Does the fan turn at all?

When you usually press the button, what happens is the switch triggers a standby current on your mother board and the power supply senses this feedback and in return, turns all power. Does anything like this happen at all?
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My bad...I had missed the part you say it came back to life.

Sometimes, heat and cold makes weird things happen....like push out connections with the contraction and expansion caused by the chaning temps. Glad to see it worked. :)
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