It was on AC power not on battery.
Last thing I was doing...that day was turning it ON. The day before probably automatic updates.
Please try the following:
Unplug any devices you have attached to it,eg wireless receiver,bluetooth....and restart it.
as it tells you to get into the setup,press F2 to get into bios and see if it allows you to load the default bios settings.
Then save changes and exit.
If that does not work i guess there must be a power problem with it.
How old is it? you have prob used it always connected on AC, so you overcharged it.