Weird Mouse Skipping Problem

Hi

Since upgrading to Snow Leopard, I'm having this weird mouse skipping/jumping problem. Here it goes:

I have two monitors plugged in to the video card at all times. If the second display is on (power on), mouse works just fine. However, if I turn off this second monitor, I'll get repeating jumps on the mouse. Every 5 to 7 seconds the cursor will stop for a whole second, even if I keep moving the mouse, then it will jump to a distant place in the screen. Then I turn back on the second display, and mouse goes back to normal.

I got a 1.1 mac pro with a flashed ati video card. I don't know if this problem is due to upgrading to snow leopard or from installing a flashed card.

Thanks!

 

Tried that, it did nothing. Thanks anyway

 

thanks for the reply.

..gee that's awful. i'm guessing apple knows about it and did nothing so far. i googled a bit and searched apple discussions, found only a couple of posts.

do you think it's exclusive to version 10.6.3 of OSX?

 

my two monitors are LG M288WA. I believe the issue has to do with ATI cards (4870/4890), but not the monitor brand.

and apparently it has nothing to do with the fact that my card is a flashed PC card. people on apple discussions are facing the bug with stock ATI 4870/4890 cards bought from apple.

I've already tested 3 mice (logitech / microsoft / bluetooth mighty mouse). the bug was there for all of them.

it's quite outrageous that apple hasn't done anything about this...it's a common enough issue. but I guess they have more serious problems, such as the silly fight with adobe.

note that it does NOT happen under windows, be it XP or win7.

 

Since I have no DVI-VGA converter, I have to leave both monitors on at all times, even though I only need them both on when I'm editing video.

This is a complete waste of energy. Thank you Apple for your huge concern for the environment! (not to mention my energy bill...)

This has got to be the stupidest bug I've ever seen.

Will VGA support 1680x1050 res?