Mac Mini Graphics Not Working Properly

I have two Mac Minis (a July 2009 model and a June 2010 model) that have recently began having video problems.
The problem started on my newer machine which has two Samsung monitors attached, sometime after the last Snow Leopard update.
Last week, the second, older machine which is connected to only a Panasonic LCD HDTV, began having the same issue.
The problem is that the actual screen resolution being run does not match the settings in the System Preferences. It looks like the graphics controller is actually running at 640x480 or 800x600 or something where everything is big but the OS (Snow Leopard or Lion) still thinks it is running at 720p or some other high resolution. So the OS reports that everything is fine even though it is very obvious, things are not OK.
When I move the mouse to the side the desktop scrolls around on the screen. it is like having a window into my desktop.
Changing the screen resolution in Hardware-Displays does not work nor does the detect display button. On the TV for instance, the Displays panel reports 720p even though it is clear that what is on the screen is nowhere near 720p. It makes videos on the TV look really bad and it makes it hard to navigate around the desktop. I can't even fit the entire browser into the sceen.
I had hoped that upgrading to Lion on the machine hooked to the TV would fix the problem, but It did not. Lion displays the same problem. I have not tried putting Lion on the newer Mac Mini yet.
I did find a workaround for the newer one with the Samsung displays – by using fast user switching, sometimes the proper graphics resolution will come up right on the second or third try/user. And if I do get it working properly and the monitor goes to sleep, it will screw the resolution up again when it wakes up, even if it was working properly before. I have temporarily turned off sleep but this is not a good option for me.
Does anyone have any idea what might be wrong or how I could fix it?
Thanks!
Patrick T.

No driver are required or available.
Just what happens when you try using the optical drive?
Try:
Resetting the SMC and NVRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
Also see:
Get help with the slot-loading SuperDrive on your Mac computer - Apple Support

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