NEW09 imac External Monitor causes mouse to freeze every 4 sec for half sec

Would love some help
Every time I connect my external monitor my mouse will stick every 4 sec for less than a half sec (not exact but it it's doing it in a repeating pattern).. If I unplug it it stops and when I plug it back in in starts again.
4 day old imac 10.5.7 fully updated 2009 CTO Ati 4850 4gigs ram 1tb storage.
I tested all of my peripherals on 3 other mac's including new 8 core and mini and it works just fine (even when I connect the DELL monitor.
Also, tried to do a mirror instead of extended desktop and the problem persists
peripherals include Intouse3 Wacom with latest driver (I thought that was the issue so I tried older drivers and uninstalled them). Mighty mouse USB and keyboard w numeric keypad
External monitor is a new dell "24 1920 1080 monitor
Thanks it would be awesome if I didn't have to lug this thing down to Gen bar

Did you do the usual general trouble-shooting?
Run Disk Utility and use the +Repair Disk Permissions+ on the startup volume.
When you restart, use the reset PRAM procedure.
http://support.apple.com/kb/HT1379
If that does not help, try creating a new admin user account in System Preferences Accounts pane
http://docs.info.apple.com/article.html?path=Mac/10.5/en/8235.html
Log out and log in to the new account. Does this same problem occur in the new account? If not, you have narrowed down the cause to something in your normal account. It could be some corrupted user preference setting, or some background process (perhaps something third party) that runs when you are logged into your normal account.
If it does occur in the new account too, restart using the Mac OS X installation disc. Insert the disc and restart with the C key held down to force a restart from the optical drive. When it gets to the Installer's first screen, don't go any further, but note if this problem still occurs (when you are booted from a different system).

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