General discussion

Dell desktop won't start with power button

Aug 5, 2009 4:24AM PDT

My dell dimension 4500 was accidentally turned off at the power strip and now won't start with the power button. There is a light behind the button but no lights on back of computer. If I hold the button for about 15 secs, the light goes out but still no power to computer--nothing happens. I know enough to open up the computer, but I am afraid to mess with the power supply or power switch board. Help!

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Links, comments.
Aug 5, 2009 4:49AM PDT shows the DIAGNOSTIC LIGHTS. is the top of the documentation so follow that to where it writes "If the power light is amber and green ? The computer is receiving electrical power, but an internal power problem might exist.

* Ensure that the microprocessor power cable is securely connected to the system board.
* If the problem persists, contact Dell. See "Contacting Dell" in the Dell Owner's Manual for the correct number to call."

Not to hold your hand here but wander around the documentation and find that connection and with the AC removed from the machine unplug and plug it back in and retry.
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dimension power
Aug 5, 2009 5:17AM PDT

Thanks Bob. I did what you said but still no power. I unplugged the main power connector and then plugged it back in, but still no power.
Do you think it's the power supply? I have a Dimension 2400 that I'm not using--could I try that power supply in it?

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Aug 5, 2009 6:03AM PDT

Try finding the documentation on the diagnostic lights. Mind you I have things like Volt meters and more at my disposal but armed with just this PC we have only what those lights tell us to work with.

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no power to dimension 4500
Aug 5, 2009 6:12AM PDT

I checked my manual and all it tells me is how the different colors of the diagnostic lights mean different things--but the lights on the back of my computer don't light up at all. It says when the computer starts, these lights should flash and then remain green. However, I have no lights!!!

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If you look at the document links I offered.
Aug 5, 2009 6:17AM PDT

That has that item listed. Sorry but I offered these links so you can do the hard work. There are no paid support staff here but I know people just need a little start in the right direction.

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no power to 4500
Aug 5, 2009 7:26AM PDT

Thanks for the help. I have done everthing that the links recommend, but still no power. I guess I will have to call Dell-I just wanted to avoid that if at all possible.

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Just a spoiler.
Aug 5, 2009 7:57AM PDT

the pages I linked to, if you follow them tell you its the power supply (most likely).

But given the cost of service be careful about paying for repairs.

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was power supply
Aug 5, 2009 2:00PM PDT

I took it to a friend and it WAS the power supply. Any advice on a good place to get a replacement for a Dell Dimension 4500 rather than my searching for hours on the internet? Thanks.

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Just the usual.
Aug 5, 2009 8:35PM PDT has dozens that will work from what I read on the documentation.

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power supply
Aug 5, 2009 11:39PM PDT

Thanks for the information.

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Dell compatible PSU
Aug 6, 2009 12:03AM PDT

Make sure any PSU you buy is Dell ready. Its important as some Dell PSU to include the LEDs for troubleshooting and possible connects are NOT all provided by the std. generic PSU out there. Thus verify before purchase it states it will work in your Dell model#. Check the link provided:

You check the www for sources, again be sure for Dell usage.

tada -----Willy Happy

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Dell power button
Aug 7, 2009 10:20PM PDT

Do you have a reset button on the front of the tower? If so this should fix the problem.

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