"A possible expansion card failure has occurred"

  Fleetblue 18:10 13 Apr 11
Locked

I have a Dell XPS 420. About half an hour ago it shut down and on the display on the tower I have the above message. The advice from the manufacturer's manual is to "determine if a conflict exists by removing an expansion card (not a graphics card)" What other sort of expansion card might I have? How can I find this out? Help greatly appreciated.

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