A friend has an old MacBook Pro circa Tiger era, and it's been upgraded to Snow Leopard which may be too far (he's considered going back to Leopard). In any case, the battery seems to have died and not just gradually but from fine to dead in one day. The machine though, when plugged into the wall will boot up, but if you run any application at all, it just closes up and shuts down. Anyone ever see this before? Weirdest thing I've probably ever seen in all my time with either PCs or Mac; it's a new problem I've never come across. He did say he had opened a suspicious email prior to this happening, but I am wholly unfamiliar with and virus or malware involving OS X. Thanks for any insight in advance!