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Thanks John,
It will turn on by itself (with out press the power button) if the power cable is plugged. Then unplug it will stay on till it time out and turn black. Then you press the power botton for 5 seconds, the lcd shows battery and charging icon, plug the power cord again, the mac turns on...
Battery shows 100% when starts, then shows 98% 99% and then shows 100% in the OS, unplugged the power after turn on the mac stays on. Tried new Q4750 Q8952, which looks darker than normal. The problem stays the same after. Any help will be appreciated.