**UPDATE**

Thank you both for your responses.  I know if I take the computer in I too will possibly be told something along the lines of "its a fried motherboard" or "a corrupted hard-drive", and will have to pay 55 bucks an hour for it. 

I've spent a ridiculous amount of time working on it, more than any average person would, but I believe I can get it back up and working.  All I've been doing is disconnecting and reconnecting all the ribbons and power supply connectors that I had to take out when I put in the new card because they were in the way.

Occasionally,  (very occasionally sometimes w/o doing anything but restarting)the computer will either boot up in BIOS or it will give me a message apoligizing, saying the computer detected that it was improperly shutdown, or that there were hardware changes.  On the later it will begin to countdown from 30, giving me the option to start up in safe mode, or the "last configuration that knowingly worked".

At one point I had selected "Last configuration that knowingly worked" and the computer started up and worked just fine.  This was with my initial TNT2 Pro card.  Now, understand, when this worked, it had been my first time unplugging the ribbon that goes into the harddrive, and I thought great, the NX6600 probably works fine.  However, before I shut down, I uninstalled the drivers for the TNT2 Pro thinking that they may have been causing a hang-up.

Put the NX6600 back in, back to freezing on "HP Invent" screen.  Tried unplugging the ribbon, no luck.  The closest I could get was a black screen with a blinking input.   .... Cursed myself up and down here for being a moron for not just keeping the original AGP card in....and then went back to installing it back in.   As of now I've got the original card back in, but have not yet been able to get the "last configuration that knowingly worked" screen to come up, without freezing (happened once).  

Its very frustrating, not sure whats wrong but the best I can conclude is that its a 5 year old computer and is having some kind of trouble during boot with this hardware change.

Only thing I wondered is that in the BIOS theres an option to reset configuration.  I'm not planning to select "Yes" because I got it to work before w/o doing so, but was curious to know when you would use that.

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