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On my macbook, with a mouse plugged in (Microsoft Intellimouse Optical), a single click will sometimes behave like a double click, or pressing the mouse button but not releasing it will behave like a click. This behavior is sporadic. Sometimes it will happen with every click for a few clicks. Sometimes it will be every other click. Sometimes it behaves normally for a while.

I've been using this mouse with my macbook for weeks without incident until a couple of days ago. This only happens at home. I have an identical mouse at work that does not give me any trouble. I'll work at home with my mouse behaving badly, go to work and have no issues, then come home and the mouse behaves badly again. At work, my mouse is plugged into a USB hub. At home, it's plugged directly into the usb port. I've tried swapping USB ports, but the behavior did not change. I've tried rebooting. That didn't help either.

How should I further troubleshoot and resolve this issue?

  • Are the mice at work and at home different units? – duci9y Oct 19 '13 at 6:07
  • I have two identical Microsoft Intellimouse Optical mice - one at work and one at home. They are the same model. – gilly3 Oct 19 '13 at 14:34
  • Oh! Then I'm sure the misbehaving mouse is having hardware issues. You should get it replaced under warranty. – duci9y Oct 19 '13 at 16:29
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    @duci9y - I didn't want to believe you, but you are correct. I plugged my beloved mouse into a windows machine and I get the same behavior. I'd be happy to accept your comment as an answer. – gilly3 Oct 25 '13 at 17:49
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The misbehaving mouse is surely having hardware issues. This behaviour is very likely not caused by software. Plug in the mouse to another computer to confirm. If the mouse is indeed having hardware issues, you should get it replaced replaced under warranty.

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You need to reset you PRAM

Resetting PRAM and NVRAM

  1. Shut down the computer.

  2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.

  3. Turn on the computer.

  4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.

  5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.

  6. Release the keys.

https://discussions.apple.com/thread/4155496?tstart=0

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