Imac intel self scrolling and zooming

Hi Guys,
<Sorry for my English, It's not my native language>
In the last couple days I found that my iMac is randomly scroll  to the bottom of page
in finder, chrome, safari, photoshop and every application
Today it just getting worse becaust it started to zoom in and out
Then, a few hours ago it started to scroll and zoom at the same time
I've look around the discussion forum and found some thread abou this issue
but there seem no solution.
my system is iMac intel 27inch
osx 10.6.8 installed
magic mouse + wacom bamboo
I'm quite sure that the problem is from the OS  becaust I tried remove the wacom, keyboard and magic mouse
but it didn't help.
Please anyone could help??
Thanks in advance!!

THat behavior sounds like it could be caused by a stuck key on the keyboard.
If the icon that is selected autonomously is the same one each time, then the first letter of its name may be a clue. If it is something other than the alphanumerical last first-letter of names of items on the desktop, then its first letter is probably the stuck key.
If its name's first letter is the last alphanumerically, then it gets trickier to find. For example, the last filename alphanumerically on my desktop starts with the letter T which means that if I press and hold T, U, V, W, X, Y, or Z it will be selected.
One way to test whether the cause is a stuck key - disconnect the keyboard (unplug it if USB, turn it off if wireless) and wait.

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