Acerpower SV PC will Not turn off

More information would help to resolve this issue.

Are you shutting down by selecting Start and shutdown or have you tried pushing the power button on push (not holding the power button)?

Try this:
Press and hold the power button in solidly for about 10 seconds. If it shuts down before you get to 10 just let off the power button. This should work, but may not solve the problem.

If you reboot it and still can not shut down from Windows, hold power button until it shuts down, unplug the power cord and disconnect everything from the computer other than the keyboard, mouse and monitor. With the power plug still unplugged, hold the power button in for about 15 seconds (this resets the power supply and can clear a corrupt BIOS).

Reconnect power and after booting, see if you can shut down from Windows.

If still no go, click Start, Programs, Accessories, System tools and select System Restore.

Follow the prompts and select a bold date back to a time before you had problems shutting down. That should do the trick.

Let me know if you get it fixed or if you need more advice.

Honest1abe