|When testing the card on a different computer did you test with your flat panel monitor or something else. That card has VGA, DVI and S video outputs. Are you using the same output in both cases?|
According to the Dell specs your tower requires a low profile AGP card. Is that what you have? If so, how did you test it in a regular case? Did the card come with two brackets?
BTW, I am wondering where you found a NEW 9200.
Are you sure you are fully inserting and locking the tang at the back of the card?
Are you using the PCI slot directly next to the AGP slot? If so, I suggest you move that card down. That PCI slot may share resources with the AGP slot.
Below is a link to the specs for that Dell model.