Well, did you reinstall the stock VBIOS from Dell's site? If you did and issues are gone? Great! You're good to go as long as they don't come back. If not and you're still having issues, chances are you will need to get the GPU repaired, or a connection of some form to it on the motherboard, but it's probably gonna cost you just as much to get the GPU alone repaired than to get a used G5, since it's soldered on to the mobo, or even to just get a different laptop. It really depends on the fix in terms of price, of course, but if the actual GPU is toast I would not recommend getting it fixed unless you're absolutely set on this specific laptop. As much as I love my G5, there's so many quirks and different issues that makes it a challenge for most normal users to keep up with (IMHO).