Have you checked Power Settings of Windows (see Control Panel)?
Acer 4620 Power Suppy Related Problem
My 4620 shuts down, goes into hibernate or standby immediately upon plugging in the power supply. The measured output of the power supply is normal. Also, after shutting down this laptop, the battery LED stays lit, with a drain on the battery. Anybody have any ideas?
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Is AC adapter original/genuine that came with the laptop? Have you tried using it in another similar laptop model? If you can, measure output voltage of adapter and compare that to what is on the label. Also if possible, try another adapter (borrow from a friend with a similar unit).
Check Power Settings as it looks like it is hibernate/standby configuration issue.
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