Video Shorts Out

I'm using a Mini with a Proview 700P monitor with a DVI to VGA adapter and am very happy with the setup until the video blinks off and on a few times then displays this diagonal line pattern, then goes blank, as in No Signal. It happens after a random amount of on-time, anywhere from an hour to eight hours, so I don't think its an overheating issue. It also happens quickly enough that I don't have time to save anything or shut down the computer. The computer seems to still be running even though there's no video. I've tried using a different monitor and it has no effect on the problem. If I restart the computer the problem is gone for a much shorter time before reappearing. Any thoughts on the issue would be much appreciated.

Hi, have you had a resolution to this problem?
I have just bought a 22" widescreen viewsonic and am having the exact same issues, having looked around the discussions on Mini mac there seems to be hundreds of people with the same issues, ie monitor shows no signal, will not stay on, screen disintigrates if any animation is played ie movies, iphoto etc..it is definately a Apple Mini Mac issue nothing to do with the monitor as lots of people with different models ahving same issues...
It seems if you leave the mini off for a while the monior will fire up str8 away, if after it has broken down you try all you get is a NO SIGNAL msg, I also have a PC and have plugged the monitor into it, works with no issues at all have left it running for over 3 days. However, put it back on the mini NO SIGNAL unless I trun of let it cool down, is that the issue?
In addition, if the monitor gives me enough time i HAVE TRIED TO GO INTO DISPLAYS AND have a look at settings, when I do this the monitor shuts down .
Apple this is a real issue, please give us a resolution (oh btw if i use the old monitor 17" flat samsung it works fine, no issues? It seems to be stuck on the settings for the samsung and wont change/accept the new monitor. Hope all this info gives somebody fuel for a fix, thank you.

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