Hi Reg,

If you go to your Apple menu and choose 'About This Mac', then click
'More Info...' then you will get into the System Profiler. Look for
'Power' under 'Hardware'. This will tell you about the battery and
charger.

You might also need to reset your PMU (power management unit). This
unit is involved in switching power and power sources, so might be the
source of your issue? Maybe the PMU memory got corrupted when the PRAM
battery went flat?

Resetting PRAM:
http://docs.info.apple.com/article.html?artnum=2238

Resetting PMU:
http://docs.info.apple.com/article.html?artnum=14449

James.

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