It looks like the Intel X25 just has horrible compatibility. It would have been really nice if any of the many reviews I read before ordering it had mentioned that.
It also is not detected by my main desktop computer (Asus A8N-SLI motherboard), and I've found that other users with that same motherboard have the same problem.
It is detected by my other PC, which has an Intel motherboard.
I just don't understand why the SSD won't even be detected when both my G4 and desktop PC have other SATA drives which work fine. (And the tech "support" at Intel didn't know either.)
I'm ordering a 7200RPM HD to replace my existing corrupted 5400RPM HD, but still I'll be stuck with having to wait 40+ seconds to come out of hibernation each time (can't use standby since the G4 goes completely off overnight so often, even with a new car battery).