One of my kids powered off my Dell 5100 at the mains and it now ont power on. The green LED is lit on the motherboard. I followed the troubleshooting on the Del web site to no avail, so I suspect that the power off damaged the power supply - can you help
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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.
Most likely the power supply have failed. Although the system is getting some power to the Motherboard (Flea power indication on motherboard) there are at least 5 different voltages the power supply provides for the system. Losing any one can cause a no power situation like you describe.
A standard ATX power supply should resolve (It is the 1st item I'd replace, both because it is the 1st point of failure and the cheapest to replace)