when i place 2 fingers on my trackpad, the cursor goes crazy and jumps! if i remove 1 finger it jumps back.... place 2nd finger back on it jumps again...... i find this really annoying, as i would like to install iscroll2 for 2 finger tracking..... sometimes the trackpad just doesnt respond either?(for maybe a second or 2) i have a 1Ghz g4 ibook. and have recently installed a superdrive... wondering if maybe i messed with the trackpad somehow? i have an external mouse, which works perfectly? any ideas?