|"I HAVE A PROBLEM WITH MY DELL XPS 600"|
Looks like you have a problem with ordinary typing too. Don't post using all capitals. It's the equivalent of shouting and also makes a block of text harder to read for most people.
Your problem sounds like the PSU (Power Supply Unit) inside the PC case may be faulty. They are not repairable. A new PSU will be required if that's what it is.