Beach ball on black screen when waking Mini from sleep

I am looking for a way to fix this frequent problem. About 25% of the time I wake this 2-year-old Mac Mini from sleep, it will show a spinning beach ball or a regular pointer on a totally black screen. The monitor connected is an Acer, by the way, and it's had multiple color calibrations done to it... Anyways, the pointer or beach ball doesn't go away if you just let it sit awhile, but it does move with mouse motion. So the only ways of getting to the login screen from there are:
hold down the power button on the computer for 10 seconds, then start it up as usual.
unplug the HDMI cord that connects to the display from the back of the computer.
What does not work:
unplug the HDMI from the back of the display
turn the monitor off and on
unplug and replug the monitor
pressing keyboard shortcuts to shutdown, reboot, sleep, etc. don't work.
So from this I've deduced that it has something to do with the Mac Mini recognizing the Acer display and having to refresh that port's connection.
What I've already tried that has not permanently fixed the problem:
Reset the PRAM
Having frequent power outages counts as resetting the SMC, right?
restarting the computer (duh)
Doing the Apple Diagnostic test
Had Disk Utility test the hard drive (well ok its an ssd) and found no problems with it.
Help! It's not so much a problem for me but one other person who uses this computer is computer illiterate and cannot do a hard reset or figure out which cable goes where. And please, please, please do not take the easy way out and tell me to reinstall OSX (it's mavericks by the way). Thank you very much.

Humm... May have something to do with the straight HDMI connection, others have also complained about similar problems using a straight HDMI connection.
1. You tried a different HDMI cable...? (you didn't say)
2. What model is your Acer and what other inputs (DVI, VGA, etc.) does it support...?
I run dual DVI Samsung monitors on my Mac Mini and have not experience any problems. One is on the Apple Supplied HDMI to DVI adapter and the other in on a Kanex Mini DisplayPort to DVI adapter.
No a power outage does not equal an SMC reset. If fact, it can have just the opposite effect and throw the System Management Controller off kilter.

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