Connects via VGA, not DVI

I'm having a bit of a display problem with my Mac mini. The problem is that any digital connection from the mini via DVI cable doesn't seem to work. Right now I have an old crt monitor hooked up with the DVI to VGA adapter and any monitor seems to work this way. I have a DVI to DVI, and DVI to HDMI cable that's always worked before with the TV's and my regular Acer monitor. One night I was on Facebook, youtube, blah blah blah. Not doing anything out of the ordinary like installing programs or applying updates. The next time I try to use my Mac and the monitor says "no signal". I plugged the computer in the tv and it was saying the same thing. That's when I took the old crt monitor with the adapter and plugged it in which that works flawlessly. I tried repairing permissions, doing the intel SMC reset, and other basic troubleshooting steps.
This doesn't apply to the display issue, but withen the past year I've had components like the airport and, Superdrive fail spontaneously on separate accounts. I have those things somewhat fixed via an external DVD burner and an ethernet wire. I don't know if that has to do with the logic board of some sort, but perhaps that can help ya guys.
What steps would you sugest next?

BSteely,
Alright. I get what your saying. I figured something like that happened, but I was kinda hoping it was a software issue since the Mac wasn't moved, budged, or handled in any way. I know most of the troubleshooting steps on a mac and a whole bunch on a PC considering that's what I fix on a daily basis. I don't do a whole lot of logic board work so I guess I'll have to live with the vga connection which I can live with. I'll have to find a decent LCD screen somewhere that supports vga so I don't have to keep this clunky crt on my desktop.
I finally decided to use the time machine feature and this is gonna do awesome. I bought a 1 TB drive to plug in through the usb port and it's working wonderfully. I know how ironic it is to have someone that repairs computers and not keep a back up.
Thanks for all the input BSteely. This isn't really anything that can be solved to I gave you the helpful star since you did give me that diagnostic. I truly appreciate it!

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