Laptop dead?

Was watching a film on Saturday night, fell asleep, laptop ran through film to credits before going into standby/auto off. Laptop was on battery power.

On Sunday, the laptop wouldn't turn on after putting it on external power. left it plugged in for 24+ hours, but still no power.

Power supply is good, showing 19+ volts at the plug.

Any ideas, other than shop for a new unit.

Thank you all in advance for any help.

TomR

offhand, the only thing I can think of is try to remove the battery and leave it out for a few minutes, put it back and try again.

Hold down the power button for a full minute. 

Thanks for the suggestions, but: the battery's not removable; and holding down the button, didn't work. 

The problem has since resolved itself.

But thanks, again.

TomR

What brand and model is it?