My trackpad will sometimes not work but external mice will.

I have the newest version of Macbook Pro. It is all up to date. Sometimes, the trackpad will arbirtarily stop working for a long period of time. However, when I plug in an external mouse, the cursor moves and selects normally. Is this normal? How can I fix it?

Erratic trackpad?
http://support.apple.com/kb/TS1449
Macbook Pro is in limited warranty for 1 year from the date of purchase.
If the Apple store is nearby, take the MBP to the Apple store for evaluation.
Best.

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Standard troubleshooting...
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Sometimes my trackpad stops to zoom with "pinch out to zoom in" function, but still works with scrolling, moving the pointer and click. After turn off/on, it works again with 2 fingers zoom.
With Mountain Lion this has never ocurred, started after my upgrade 5 days ago.
Batteries were recently replaced, now they are 82% charged.
Any guess?
Thanks in advance!

Update:
I removed the TrackPad device from paired bluetooth list, and connected back.
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itexpress wrote:
Forgot to add, we are running XP. We tried a different monitor and now at least we can get one monitor working via the display port. But when we try two monitors at the same time, the 2nd monitor on display port is not detected. How do we disable built in LCD on the X201 ? Lenovo support says its a BIOS setting ? That doesnt sound right to me...
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Hi
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I am using an rmbp with win7 and macosx.
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My trackpad will sometimes not work but external mice will.

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