I switched to an Nvidia GeForce 7600 GT. That's what I have now.
here's a saga... DELL replaced my GeForce 7300LE when I had an identical fault as yours. Good work on using the snapshot. It was within a few months of the warranty expiring. Well done to DELL. That second card had an identical failure within a month so I called DELL again. They came and replaced that 7300 LE with another. I asked if it was an inherent problem with the card or system. No comment. Now, less than a year later the card has failed again with the same fault. I don't Game too hard but I do like to be able to read the screen. I'm going for a HD 4670 which appears to be compatible with the PSU/CPU and space available. I 'almost' believe that the card/s failed when I updated their drivers from the DELL website. Coincidences?
Good luck with the 7600 GT and let me know why you chose the 7600GT.