Power down the machine completely, unplug it from the wall and remove the laptop battery.
Wait 30 seconds
Re-install the battery, plug it into the wall and start it up.
It sounds like you are having a power supply issue. Sometimes the trick above 'wakes it back up' so to speak.
Otherwise I would get some service done to that machine, you may need a new battery, sometimes a bad battery will cause this issue. Try plugging it in without the battery attached and see if it starts that way.
Try it with only the battery fully installed but do not plug it into the wall.
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