Lenovo Laptop doesn't turn on and indicator lights don't turn on either.

Laptop appears completely dead, doesn't make a sound or flash any of the indicator lights when I try to turn it on. Charger is not the problem, as I have checked with another laptop and another charger.
Battery is not the problem, as I have tried to turn it on without the battery (only AC charger)
In detail:
The Laptop is a Toshiba Satellite P300-15D, about 2 or 3 years old with absolutely no hardware changes (and absolutely no physical damage. I almost never move it.)
I'm not sure how it powered off because I wasn't close to it when it did, but it had the battery in and was plugged in. I have another Toshiba laptop, which I used to check if it was a problem with the charger. The charger works fine, and I also tried with the charger the other laptop.

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