Monitor aspect ratio and resolution issues

[boothout]

I have a 30" Mac monitor that has worked perfectly for years. Today when I powered up, the aspect ratio had changed to 4:3, had a different background image and had horrible resolution. I've tried going into "displays" and changing the resolution, but to no avail. I also tried resetting my PRAM and that did nothing. Anyone?

 

[simsaladimbamba]

With what hardware do you connect to the 30" Apple Cinema Display?

 

[boothout]

I am using OS-X 10.5.8 and the standard cables that came with it.

 

[simsaladimbamba]

I am using OS-X 10.5.8 and the standard cables that came with it.

I meant, with what actual Mac do you use it?

 

[boothout]

Mac Pro.