I recently bought a really nice condition late 2006, black MacBook (2Ghz C2D) - bought mainly because of the condition - none of the usual cracked plastics! Didn't come with a charger, so after buying one and plugging in this was the outcome: After connecting power there was a brief flash of the battery charging indicators then nothing - pressing the test button showed nothing either. The MagSafe plug light was green too - presumably showing it wasn't charging the battery? Turning on, the MacBook had no OS, so I installed Lion and once up and running it showed the battery as present, with 36 cycles on it but not charging. I reset the PMU - now the MagSafe plug light was at orange (charging?) but the battery was still showing up as not taking a charge. Leaving the MacBook off but "charging" for a few hours, I turned on again and the result was the same..another PMU reset however returned the black cross battery icon top right and the system couldn't see the battery at all. After another break, I booted from an Elementary OS live disk - that showed the battery as charging and on 1% but after half hour went to 0% and not charging. Whatever the problem may be, the MacBook seems to be stepping down the CPU - this is evidenced by a poor Geekbench score (1000 less than it should be) and poor video playback - which I gather is an Apple "safety feature." Is there any way to bypass this? I found that running another Linux live disk, Terminal reveals the CPU isn't being clocked down in Linux (apart from normal scaling) so it must be an OSX feature not hardware based. From what I've seen, anyone have a clue whether it's simply a bad battery or a charging circuit problem? Such a shame on an intact black MacBook!