Really annoying mac pro problem

[Macpropro80]

Hey everyone, I have a 2008 Octo mac pro. I recently got two new nvidia gt120's for it. I noticed that after about 15 minutes of use, or if I use a program that puts ANY load on my CPU, my mouse jumps around like its having a seizure. It makes the computer UN-usuable. It started after I updated to OSX 10.5.8, and It continued even after I installed Snow Leopard. I tried resetting the PRAM, Doing a repair disk permissions, changing the surface the mouse is on, using a wired mouse, a wireless mouse, changing mouse brands and NOTHING worked. Can someone please help me? Im about to ditch this computer. Its becoming a $4500 frustration generator. I use an MX Revolution desktop mouse (wireless) I tried a logitech G7 wired mouse, and it didnt help. I also tried a kensington wireless mouse and still had the same problem. The problem is most noticeable in iTunes. I also tried different USB ports.

[Macpropro80]

quick thought could this be why apple doesn't officially support the GT120 in the 2008 mac pro?

[sparkie7]

if you still have your 2600XT lying around.. take both 120GTs out and put it back in and see if your problems go away

[tribe3]

quick thought could this be why apple doesn't officially support the GT120 in the 2008 mac pro?

Tough... I had my mouse going crazy on my 2006 machine once in a while but it got fixed by plugging a non-Apple mouse for a while ...random I know but it was a fix.

In your case the only thing you got is changing back to the old card and see if it works.

Good luck

EDIT: Hey sparkie; both posts at 11:35 PM (my local time) ;)

[Macpropro80]

Tough... I had my mouse going crazy on my 2006 machine once in a while but it got fixed by plugging a non-Apple mouse for a while ...random I know but it was a fix.

In your case the only thing you got is changing back to the old card and see if it works.

Good luck

EDIT: Hey sparkie; both posts at 11:35 PM (my local time) ;)

It didnt help...... I am really about to lose my patients with this machine. It has given me nothing but problems since I bought it last august.

[kellen]

It didnt help...... I am really about to lose my patients with this machine. It has given me nothing but problems since I bought it last august.

I hope no one dies! Or did you mean patience?

is anything else running or taking up cpu while this happens?

[Macpropro80]

I hope no one dies! Or did you mean patience?

is anything else running or taking up cpu while this happens?

It usually starts when I open Final Cut Pro, itunes, or quick time. Or leave the computer on for more then 30 minutes.

[forester54]

do you still have your original MP mouse? see if it does it with that as well. Just start a process of elimination