I have an old (Bought in 2003) emac. (White desktop version) When I go to "About This Mac" it says: Version 10.4.11.(Upgraded to Tiger a few months ago).Processor: 1 GHz PowerPC G4. Memory: 256 MB SDRAM. When the computer goes to "sleep" and then I try to use it, it shuts down. When I start it back...