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First, this is not a Laptop, but a desktop machine. I am running Precise Pangolin.

I often notice that, when I am away from my computer for a while (usually at least 15 minutes or so) and come back, the monitor will be black, and the monitor's power indicator will be orange rather than the usual green, so I just assume the computer is in suspend mode. But then I move my mouse, type on the keyboard, etc., and the display stays in the same state. The power indicator on the tower itself is solid green (On) all throughout this process.

Whenever this happens, I end up having to push and hold the computer's power button to turn off and restart the computer.

I have looked for similar questions, and the closest I can find are questions about laptops relating to suspend/hibernate mode. Does anyone know what could be going wrong?

EDIT (5/21/12): This is happening less often now, but it still happens. My temporary solution is to force the machine to suspend anytime I know I'll be away for more than 5 minutes. It isn't ideal, but at least it keeps me from having to "brute-force shutdown", and possibly lose a lot of data, quite as often.

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it has something to do with your OS because the monitor doesn't have it's own time to start up, or your computer is slow on reappearing, so just check these things. by the way the monitor does take a while to reappear by not after about 5 minutes, it's the OS your running or the monitor itself.

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"just check these things" -- How? What things specifically about the OS? I am running standard Ubuntu 12.04. I was pretty sure it wasn't the monitor to begin with -- I've never heard of this type of problem being a hardware issue. –  Mitch_W May 23 '12 at 14:28

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