Cinema Display on Mac Pro is blurry since my move

Thanks for your direction. I need more information though. Under "Displays" the only highest option is 1280 x 800. How would I be able to choose or make it a higher resolution? Yes the screen is slightly zoomed... do you mean hold down the control button and the scroll bar to make it go back to normal??

I have am on a MacPro OS X Version 10.4.11. I believe it is a 30" monitor. OK gentlemen what is a DVI (I am guessing something like Digital Video Input??)And where do I find that? I am about to copy info from "About this Mac". I have scrolled out as much as the mouse will allow. I must admit your questions are baffling me-- I am not that technical, but hopefully this will answer your questions.

NVIDIA GeForce 7300 GT:

Chipset Model: NVIDIA GeForce 7300 GT
Type: Display
Bus: PCIe
Slot: Slot-1
PCIe Lane Width: x16
VRAM (Total): 256 MB
Vendor: NVIDIA (0x10de)
Device ID: 0x0393
Revision ID: 0x00a1
ROM Revision: 3008
Displays:
Display Connector:
Status: No display connected (???)
Cinema HD:
Display Type: LCD
Resolution: 1280 x 800
Depth: 32-bit Color
Core Image: Hardware Accelerated
Main Display: Yes
Mirror: Off
Online: Yes
Quartz Extreme: Supported
Rotation: Supported

GOT IT FIXED! Thanks, my husband, a pc guy of course, followed your advice about the DVI, and got the screen back in shape. Now! ugh! I have the scroll from the mouse permenantly "on" and can't stop the curser from scrolling. Will I ever know all the stuff I need to run my own computer?!? Thanks for your help, gentlemen!
xxx ooo