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hp prodesk 400 g1 won't boot up

prodesk 400 g1 mt
Microsoft Windows 7 (32-bit)

I upgraded some software that required changing the screen resolution.  It gave me a suggested resolution, so I chose it.  Then a box appeared on my screen with a black background.  I could not get out of it and did not have any control from the mouse or manually on the monitor to exit, so I pulled the power cord from the back.  After I plugged it back in, the power button was red and I get 4 beeps.  Can't boot up.

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