Mouse stuck in left corner at login screen

Recently as in this morning i havent been able to log in, the computer starts up and appears ok untill you try to move the mouse which doesnt respond. The text field for your password is highlighted and the cursor is blinking but it doesnt respond at all, you can turn caps on or off or enter text. ive also tried safe mode and repair the disk with disk utility when booting off a os x cd. using an osx cd everything functions perfectly. im currently reinstalling mac os x 10.6 to see if that fixes it but im not sure it will.

Just this morning I had the exact same problem. I just installed Windows 7 on Parallels, and shut down the computer yesterday after it hung. Today I turn on my computer and the mouse is at the top left of the screen, and the cursor is blinking in the password field, but I cannot move the mouse or enter a password.
I have tried to reset the SMC (http://support.apple.com/kb/HT3964), I have restarted with the boot disk and the disk utilities found errors and repaired them, but it didn't help. I saw a solution posted here (http://support.apple.com/kb/HT3964)from Deanoh (post 5) where he suggests resetting the PRAM (1. Restart your computer while holding down the keys CommandOption+PR.
2. Wait for your computer to chime twice before releasing the keys.
The screen will flash when the PRAM resets.)
BUT this did not help.
Deanoh's second suggestion is interesting as before my computer crashed yesterday it was constantly showing an error "could not connect network drive"
I have been trying to find out how to disconnect a network drive without logging onto the computer, because I can't, but haven't found a solution yet.
I have tried restarting in single user mode (press cmd-s at restart) but at the prompt I cannot type anything.
I know my keyboard and mouse work, as I used them to repair the disk using sidk utility when I booted using the Mac OS X cd.
If anyone can come up with any other suggestions I would love to hear them. I really wouldn't want to format my hard disk restore from my time machine backup, it's my last resort, but even then I cannot guarantee it would work, as then backup is up to date and backed up the computer in the current state!
Thanks

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