Last night I tried adding a 7600 GS AGP to my 4550.  Swapping out the old card for the new one went fine.  Removing the old drivers for the new drivers seems to have gone fine.  However, when XP loads up I get a nVidia message pop-up saying that the card is not receiving enough power and that it is slowing down it's speed to compensate.  I did a search on these forums and read that people usually have no problem with a 7600 GT or even a 7800 GS.  The only parts that I have added from stock is a second HD and added 512 of ram.  So can anyone think of why I'm getting this message with just a 7600 GS?

 

Edit: I have also added a Sound Blaster card.