My video goes out and comes back on frequently

Hi,
I have a mac mini and the video goes out (blue screen) with an error that says "Check video cable." It will then comb back on without doing anything but it can take several seconds or a minute to do so. This happens randomly not dependent on doing anything on the computer or not. It seems to happen consistantly maybe every 20 minutes or an hour apart. This computer is being used as a cash register so this is quite frustrating when you have customers waiting.
Anyone have any clues? I swapped out monitors to rule that out and even replaced the VGA cable. The only thing I did not replace was the video adaptar.
Is there a way to reset the video with a keyboard sequence on startup or does anyone have any other ideas?
Thanks you,
Barb

Hi Barb,
Have you done a PRAM reset, CMD+Option+p+r...
http://support.apple.com/kb/HT1379
In fact, do 3 in a row, takes a bit of time.
Intel-based Macs: Resetting the System Management Controller (SMC)...
http://support.apple.com/kb/HT3964
Possibly more important, check this...
1. Open System Preferences > Security & Privacy > General. Click the padlock to unlock the preference pane and enter your admin password. Click the Advanced button at the bottom, then see if the option "Log out after N minutes of inactivity" (where N is the number of minutes) is enabled.
2. Open System Preferences > Energy Saver and configure Display Sleep to occur after the account is logged out, by dragging the slider to a number of minutes that is greater than N was set to in the previous step.
Important: If automatic log out is not needed, disable "Log out after Nminutes of inactivity" in System Preferences > Security & Privacy > General. This will also prevent the issue.
http://support.apple.com/kb/TS4135?viewlocale=en_US

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