If you are running Windows 8, it is possible that the system has not performed a complete shutdown.
Power the system off. Press power to start the system and immediately hold the power button down, again.
This should force the system to power off.
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Acer is proud to announce the promotion of Philetus to the ACE team. Philetus has been a member since March 2013 and has shown the skills and patience required to be a member of this exclusive, invite only team of experts. Congratulations Philetus!