What I do is take the battery out and put it back in.
But make sure you don't have the charger plugged in or it could damage if not break your laptop.
Broked
its probably broken or not plugged in
The battery is dead.
Press a button. If it is not charged it won't turn on.
Press the Power button. Some laptops have a remote and infrared box, so you can turn it on that way, too. Make sure your laptop is charged and the battery is secure if it's not turning on with the power button.
Might be that your charger is messed up or you may have plugged it wrong or the charger doesnt work
Leave the laptop off. Allow the AC power adapter to fully charge the battery for 12 hours. During this time, do not use the laptop or turn it on. This can slow down the charging of the battery.www.laptoptown.com
Unless there is something specifically wrong with it make sure the battery is charged and that it has gas in it and turn the key. Is there something wrong with it?
Does it turn over? Does it have spark? Fuel?
You may need to replace the battery, charging port, or your charger. It may not be charging correctly.
You will need to use the power cord and/or the battery in order to turn the laptop on.
the ignition switch is bad
Try plugging the device into the wall and turn it on. If it still doesn't turn on, you may be dealing with a shorted motherboard. Hopefully it is under warrantee then. If it works with AC power, then it very well could be a battery issue.