Wow, sounds bad. Things I'd try...

Unplug it, plug it back in.

Look for a little breaker switch on the back of
the computer near the top. I think it's usually red.

Do the same for the power strip.

Open up the case and vacuum out the dust.

Check the monitor on another computer if possible.

Make sure stuff is actually plugged in, like the keyboard.

Does the box beep? If so, the beeps are an error code
you can look that up to see what hardware it thinks failed.
http://www.computerhope.com/beep.htm

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