yeah, i second that, contact Dell for a new power supply. (If you get through to them.....) Also, for a future new computer, Do Not go with Dell. Their service isn't worth it and you could make a better computer for about 1/2 as much as Dell charges for their "Top of the Line." If you don't feel comfortable building one, go with any other company other than Dell.
AMD 3200+ sckt 939
1 gig of corsair value ram
250 gig sata150 WD hard drive
Dynex 5.1 sound card
Evga 6600 256mb Pci-E video card