Dual Monitor Turns Off - Can't Get Back On

I am using two monitors through a mac mini. The first, a Gateway LP2417, I am using with an HDMI cable. The second is a Samsung  2032NW which I am running out of my mini display port through a VGA converter. After the monitors hibernate I can never seem to get the main monitor (the Gateway) back on without unplugging and replugging everything. This is my first mac that I have owned so it could very well be user error. Is there a way of forcing the computer to send the monitor a signal without turning it on and off or unplugging it? I am aware that it is supposed to "automatically" do this, but when it doesn't what other options are there? I would be willing to use another combination (DVI, HDMI, VGA, etc.) is that's the issue.

Hi,
Try holding the home and the power button together for about 5-10 seconds and see if you see Apple logo on the screen if not it might be a hardware issue if you do whoop issue resolved.
Cheers
Mann

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