Computer Won't Turn on After Cleaning

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sumdumgrl

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I really don't know a lot about computers and I have a feeling I'm not going to be able to solve this one on my own. But I figured I'd try anyway before I spend money bringing it into the shop. A few months ago I had my computer reformatted due to a virus. That's not my problem, the computer was working fine after that. But the tech told me I should clean the dust out of my computer every so often with compressed air. The direction he gave me was, open it up and blow the dust out. And that's what I did. I unplugged the tower, opened it and blew the dust out. I didn't touch anything in the computer. I plugged it back in after I cleaned it, hit the power button and nothing happened. It's in the same power strip it was in before and everything else in the strip is working fine. In retrospect, I'm thinking maybe I was too aggressive with the compressed air. Did I short it out? Could I have knocked something loose? Any info would be appreciated.

In case it might help, it's a Dell Dimension 8400 desktop computer.
 

etaf

Wayne
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Could I have knocked something loose?
Yes, take the poer lead out - and take the side off - and check everything is seated correctly all the cables and and also any boards or chips plugged in to the main board

What happens when you switch on
any noise , fans running , lights etc , bleeps
 

sumdumgrl

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Jan 22, 2011
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23
Everything seems to be where it's supposed to be. No cables are hanging loose. I did check that all the plugs were pushed in. There's one area in the front of the tower that's difficult to get to so I didn't check those. But I don't think I could have knocked anything out, as it's difficult to get to.

Nothing happens at all when I push the power button. Though, when I plug in the tower the light in my room dims very slightly for a second. So I know power is going into it.
 

etaf

Wayne
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65,454
sounds like the power supply has gone - if nothing is working at all - No fans or lights in the machine.
or something is faulty in the PC and making the powersupply crowbar and shut down - its a case of now faultfinding by removing connectors etc -
do you know your way around a PC
 

sumdumgrl

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Jan 22, 2011
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Not really. I'd be nervous to start unplugging things for fear I'll forget where to plug them back in. I think it's best I bring it to someone who knows what they're doing.
 
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