If it happens to be something to do with the graphics card, I have an identical replacement in my own computer. The thing is, I am currently using it. It is an EXACT replica of the card in that computer: a RADEON x600 series hypermemory 256 MB GPU. When my new graphics card comes by UPS on monday, I suppose I could swap out my card and put it in that one. I would prefer to not touch the card until I need to, because of the obvious chance of maybe cracking one of the two, damaging it, or anything like that. Of course I am very very careful with delicate electronics, but I still do not like to touch them if it is not necessary, especially if they are "of age." These computers are nearly 4 years old, as are all components.
Despite the possibility that it is the graphics card, I truly believe it is a software problem, not hardware. It believe it is something in Windows. However, if we cannot figure it out by Monday, I will attempt that GPU switch. I know exactly how to do it, but I truly think it will do absolutely nothing.
It seems the name I chose for this thread is quite accurate: 40 views and 8 posts with zero success. =(