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It's possible that your computer froze during sleep. First, unplug the power cord, (with the cord removed) press the power button for 10-20 seconds. PS: You will lose any unsaved data prior to sleep mode. Let me know if this doesn't resolve your problem, might be something major.
You should be able to just press the main system unit power button to wake up your 'sleeping' computer which will then resume your Windows desktop and bring you back to the Login panel if you have a password set for your account.
Try hitting the "Windows" key on your keyboard to bring it out of sleep mode. The "Windows" key is generally found on the bottom row of the keyboard, near the Alt and Ctrl keys, and it has no letters on it, just the Windows logo. That key brings my Windows Vista machines out of sleep mode when other keys won't.
As for the power button, anytime you need to force a computer to turn off, you can press and hold the power button to do so. Usually, you need to hold the power button for 5-10 seconds and it will shut down. Use this option with caution, as it turns the computer off without running through the shutdown process and can cause you to lose data.
If you can restart it and it starts up fine, then I would go into the power settings and disable sleep mode. Every computer is different on how to wake a sleeping computer, so you could read through your manuals and find out for yours, but I just disable sleep mode on all computers so i dont have to hassle with it.