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I have a Mac Mini. I also have a cheap optical mouse.

The two do not seem to be able to co-exist.

I've tested the mouse on a Windows PC. I've tested the USB ports of the Mac with the keyboard and another, similar mouse (but one which is rather terrible ergonomically).

Can anyone suggest things I could try to reolve this?

I've turned the Mac on and off several times but it's done nothing. Occasionally a mouse pointer will appear for a couple of seconds under the Apple logo in the top left of the screen, but it won't move and clicking has no effect.

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Does the mouse have some kind of instructions saying that it's compatible with Macs? And also have you checked the mouse preferences in SysPref? –  theAmateurProgrammer Sep 10 '12 at 8:24
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You should also check in the USB section of System Information to see if the Mac recognizes it at all. –  CajunLuke Sep 13 '12 at 18:25
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3 Answers

Could you tell us what brand the mouse is. If it has a driver you could try that, they sometimes help. The other answers also all seem like good things to try.

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Welcome to Ask Different. Questions for the poster should be asked as comments to the question. That said your answer does give another possible way to fix it. Could you edit and flesh it out a bit more, making it more of an answer than a suggestion? That would be very helpful. –  tubedogg Sep 1 '13 at 3:37
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Best way to see if they recognize each other: Go to System Information. You can do this a couple ways, but the quickest is to hold Option and click on the Apple icon at the top right. You will see "System Information" where "About This Mac" used to be.

On the System Information screen, along the left you will see these categories: Hardware, Network, and Software. At the bottom of the Hardware portion, you will see the USB section. Click here, and you will see your mouse if it is recognized by the computer. It will be listed under one of the USB Hi-Speed Bus's.

You've already taken the other troubleshooting steps, so I'm guessing that it won't be there. If that's the case, then the mouse doesn't work with your Mac, unfortunately. I have only seen this on one other mouse, and it was a cheap Logitech.

I hope this at least confirms something for you, even though it may not be the news you wanted. Might have to get a new cheap mouse, but at least they aren't too terribly expensive these days.

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Use a different port! If not check the settings of the mouse in the Mac. Also this is a wireless mouse or wired mouse? Try bootin into Mac w/o mouse and once it's fully up after login connect and try again or plug it in before starting.

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