|The stealth 3d 2000 is a really old video card. That's just its logo flashing on the top of the screen prior to the normal computer logo or posting screen. Are you sure that's a vista machine (you're in the windows vista forum)?|
Give it a minute or two before you decide to shut it off or reboot. Sometimes it takes a bit before an error comes up, especially if it's related to the hard drive.
To get into bios setup for a Dell xps 410 start tapping F2 as soon as you start it up.
Did anything happen to the computer or did you make any changes to it between the last time it worked OK and the first time it didn't?