Mac Mini and blue screen.

I've had my mini for just over a month now, and in recent weeks my screen has started to go entirely blue at random intervals and not clear. I'm left with no icons, no mouse, no programs, yet I get sound (although any control of it is delayed by about 30 secs to a minute). I have reinstalled ALL my software, made sure everything I download is virus checked, checked all the connections at the back of the computer etc; yet it continues to do it.
It doesnt seem to be related to any certain activity, program, volume, display options or anything else i could find to check. Sometimes it happens right after startup, and sometimes when it is woken up, but generally it is when I am using it; which forces me to restart by the power button and lose whatever i was working on.
As I said I can find no problem with the software, which leaves me to assume its the mac. I have coursework needing done at the moment and so I would rather avoid having to send it away. Does anyone know what may cause this?
Thanks.

Well, there is a known "feature" in the ATI graphics that prevents it from working properly with certain monitors if the pixel clock exceeds 135MHz (when using DVI). I had something similar to what you describe, but it didn't take a month for it to happen in my case. For me the problem was immediate, so I don't know for sure if it is the same issue.
As far as I know, if that is the issue you are having, the only way to get around it is to switch from a DVI connection to VGA, or get a different monitor, or use a program like DisplayConfigX or SwitchRes X to try and lower the pixel clock if you want to continue using DVI. Can you post certain details, like your monitor brand and model number and the resolution you are running?

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