It's just sitting on my desk at the office right now. When I get back to work Monday, if I have time, I'll probably start dismantling it to check the capacitors and anything else that may be wrong with it.
Fortunately, the G5s are not a pain to disassemble, unlike the White Intels.
Yes, it's possible. It has a SATA I controller. For some reason, SATA III SSDs seem to have issues with this controller, so get a SATA II SSD.maybe put an SSD in it (if it's possible; haven't looked at the feasibility yet) and to play SimCity 4 on it.