Thank you for using the Dell Community Forum.
It sounds like you may have fried your motherboard if you heard a loud pop when you turned it on. Pull all the cards and memory off the motherboard and turn it on. If you do not hear any beeps then, the motherboard is broken.
Social Media Support#IWork4DellDell Support VideosDrivers and DownloadsDriver order
Report Unresolved Customer Service Issues here I do not work for Dell. I too am a user. The forum is primarily user to user, with Dell employees moderatingContact USA Technical Support
Get Support on Twitter @DellCaresPro
Did you re-wire the 20 pin connector? or just connect it upside down?
is this the psu from PC Power and Cooling? If so you shouldn't have had to re-wire it
HAs the problem been fixed?
what did dell say?