I'm not familiar with your model of printer but here's one thing to try. I had a similar problem with my HP D1320 model. It was problem free but after changing the color cartridge it took forever to print one page (like 30 minutes). I used their online support and if I remember correctly I was told to hold in the on/off button and, while doing so, open and close the lid 3 or 4 times. That was supposed to "reset" the system. Ultimately we found my problem was that I needed to change my black cartridge --even though it was still half full of ink.

I should probably tell you there is another printer attached to this computer, but it prints fine. Well now, perhaps the computer cannot access a USB printer and one using the LPT1 connection. Long time since I had an LPT1 connected printer, not sure if there is anything in the BIOS to affect this. Was the old video card separate or built into the mobo? You might try reversing that just to confirm whether it has any bearing on the printer. Seems odd but anything is possible I suppose. If the old card was built in did you make the changes in the BIOS to accept the new card?

I have found on some models for some reason they want you to replace the black cartridge also, have you tried removing and replacing the current black cartridge along with the new color one? you may try that and even adding a new black one to see if that is what it takes. and to clarify is it printing at all? does the black print? what happens when you do try to print?

I can certainly sympathize with your situation...I have been without a printer for many months now because the ink cartridges are so expensive. I have a Canon Multipass 550 which has been a lifesaver in the past...being able to fax, copy and print...then when you do breakdown to buy one...install it and it still says empty cartridge, you really want to scream. But get this...the cartridge isn't the problem...it's the print head...to the tune of $50 or so and this is the third time I have replaced it and lord only knows how many cartridges were full before I wised up! Now get this....those print heads can be washed in your kitchen sink, dried on the counter and reinstalled...I sure am glad I saved the other two, i'll try that next time! But, now...I can't get the printer to print everything on the page....it prints one or two lines of the document, then skips a good paragraph size area and picks up the print again......any suggestions! and of course, it doesn't help that the manual is online and no hard copy is provided...I'm ready to do the old uninstall/reinstall thing and see if that helps! Technology sucks....here today, obsolete before noon the next day! and it wasn't a cheapee either...about $250- $300 smack a roos 2-3 years ago! Even with the cheapees....you spend a fortune on ink, that's were they make the money i guess! So what do I have to lose if the washing dosen't work......blank pages! Congratulations to anyone who can buy Canon Cartridges for $2.00 what is the secret! Here is a link that might be useful: http://homepage.ntlworld.com/wilf.james/cartclen.htm