Sounds like a power pack problem. But when it does run, have you had any other problems? Are you using Win XP?
SOURCE: How do I remove the power button on Dell Dimension 8300 desktop
open the side- and along the just inside the front exposed edge there are several tab that get push inward to release the front. They have a tendency to catch again when you go to the next one...you'll just have to play with it a bit. once that is open you'll see the other little plastic tab that holds the switch assembly . Don't forget to UNPLUG the power supply.
SOURCE: wiring diagram from the LED power button board to
Go to the Dell web site and type in you computer information and look for a pdf download for repairing the Dimension 8200. Dell is real good about giving you any information on fixing your computer. And it is usually free. I use them all the time. If you are having problems finding it on there site, you can call them and request the information you need...Hope this helps you,,,Darren
SOURCE: Dell Dimension 5100 will not power up
No doubt you've fixed this or given up by now but in the interest of helping others with this problem here is a solution. I had the same problem and it turned out to be the Front I/O & Control Panel Assembly. I suspect that the USB ports had shorted out and took the whole card down. The not turning on problem was preceded by the USB ports failing. I couldn't figure out how to bypass the card to power the computer. Dell won't help if you are not under warranty (unless you purchase some additional support). I couldn't find a replacement board on Dell's web site but found some other vendors that sold them. I bought one for about $70 and it did the trick. There seems to be at least two similar model numbers for this card. I don't know if they are interchangeable or what the differences are. If you look on the card there should be a series of numbers. Look for an "X" followed by 4 numbers. In my case it was "X8682". This is the model number for the card. If you search for shopping sites with your Dell model and this card number you should find vendors to buy the card. I think this is a design flaw having the USB ports on the same connection as the on switch. It looks like many people have had this problem. One bad usb port and your whole system is taken down. My guess is that the average user is not going to be able to figure this out and will spend lots of money unnecessarily. For those comfortable opening up the case and covers (you can download the manual from the Dell site) and unplugging ribbon cables this is a fairly simple fix. Keep in mind the card won't come with any instructions. Make sure you follow power safety rules and ground yourself.
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