Plz help Problem with 5500 graphics card

I have a 5500 fx graphic card in my dell dim3000, It was working fine but all of a sudden I heard a kinda die down noice and my monitor went blank. I chked to c if my monitor was the problem by unplugging the graphic card from monitor and it "monitor" worked  fine,I saw the DELLcolor bar, then I connected my puter to my previous g-card and I can see screen , I think my 5500 g-card is defective ... any advice to chk it and see if it is would be appreciated.... I think I need to return it for replacement that is the 5500g-card.

By the way I reinstalled the program because somehow my PC wasnt reading the software and after I connected my monitor to chk and c if it worked but it didnt,,, so i went back to previous g-card again to post message......................