XPS 410 Power Supply?

Last Week I got a BFG Tech 512MB 8800GT OC Graphics Card and while Games seem to run fine, whenever I tried to play a DVD my computer blue screened and gave nv4_disp.dll causing the stop.  I contacted Nvidia about the issues and they wanted to know some things about my PC, I contacted Dell over the phone for that information and as soon as I checked the box and saw 425W min requirement and heard it had a 375W power supply that there were problems.  Nvidia refused to further assist me because my power supply is not up to the min requirements, even though I can run games and other things just fine, just not DVD's.

I've heard Dell uses proprietary power supplies in some of their computers so I went back to Dell to see if they could tell me whether or not it was a proprietary power supply, figuring upgrading a power supply would be cheaper than simply throwing away a $200 video card and buying another video card that was compatable.  One Dell tech told me it was a proprietary power supply, but because it uses the same pinout as an XPS 420 I could get power supplies for the XPS 420 and they'd work, and that Dell spare parts and upgrades has power supplies for it up to 800W.  Then I call Dell spare parts and upgrades and they refuse to let me buy an upgrade for my XPS 410, and won't tell me why.  Then I call Dell tech support again and tell them a tech had told me that there are PSU's for the 420 that are up to 800w, he says the only one for the 420 is a 425W.

Then I go looking to see if I can get an adaptor to make an atx psu work in a Dell mobo.. my model number is not listed amoung the ones that the adaptors work for..

I go looking to see if other companies make compatable PSU's.. nothing for the XPS 410.. then other forums have people using ATX supplies in XPS 410s..

So much conflicting information, which is it?