|Are you getting any beep codes or lights when the computer is first turned on? I believe that Dell use a light code for identifiing problems....look to the dell website for a download of the manual to show what the codes are.|
If not then this could be caused by a few issues.
1) your motherboard shorted out
2) your power supply has failed
3) the on-board BIOS battery has died and needs to be replaced
4) The Bios has been damaged by improper flashing.
In reference to 11/05/2008
"So this is how liberty dies. With thunderous applause."
- George Lucas