If your computer isn't turning on properly, it may be stuck in Sleep Mode. Sleep Mode is a power-saving function designed to conserve energy and save wear and tear on your computer system. The monitor and other functions automatically shut down after a set period of inactivity. Once the computer is needed again, it starts back up and recalls all the previously open programs, allowing it to start processing again much faster than a full start-up. Sometimes a computer can get stuck in Sleep Mode and troubleshooting is required.
Plug your computer into a wall socket if it isn't already. If your batteries are running low, the computer may not have enough power to come out of Sleep Mode.
Push any key on the keyboard. Many computers respond to any activity and come out of Sleep Mode with the push of a key.
Search your keyboard for a sleep-specific key. It is normally near the top of the keyboard and has a symbol of a half moon on it. Your computer may require the push of the sleep key specifically to bring the computer in and out of Sleep Mode manually.
Move and click your mouse, since many computers also respond to that stimuli to come out of power-saving modes.
Press and hold the power button on your computer for five seconds. This should bring the computer out of Sleep Mode, or it will do the opposite and cause a complete shutdown, which should allow you to then restart the computer normally.
Unplug the computer and remove the battery if it has one. This should force a total reset of your system, and the computer should restart normally once power is restored. If it doesn't, there is something else wrong with your computer and your system likely needs servicing.