Ive got a fairly vexing problem here...I'm on a 15" 2.53Ghz MBP (late 2008 unibody). i recently had my computer out, started it up, and instead of the startup dong I received 9 very harsh sounding beeps in series, 3 short 3 long 3 short (much like SOS in morse code). Following the beeps, the computer will boot normally after several seconds. In reading here and in the Apple discussion forms, there seem to be a few conflicting ideas as to what it is, although I believe the most accepted is it being some sort of firmware update issue. As far as I or Software Update can tell, all firmware is up to date. Also, if I look for the firmware restoration CD as suggested in more than one thread at Apple.com, there is no such download for the macbook5,1. Another interesting detail is that this seems to only occur when the computer is booting under battery power, which makes it seem like a battery firmware issue, specifically. Any ideas, or similar situations? Im thinking of doing an archive install, as that was another suggestion to make sure firmware is all up to date and being used correctly.