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Old Mar 18th, 2015, 03:14 PM   #1
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Late 2012 iMac Issues

This is kind of difficult to explain so please stay with me.

Recently I've been noticing my mouse jumping around the screen by itself, it was an old Logitech G5 wired mouse. I also noticed when doing basic things like scrolling on webpages that I would get the spinning wheel every so often and it would last for a couple seconds.

I've heard that this could be a failing drive, but things get weirder.

I replaced my old mouse with a new Logitech G502 wired mouse. Installed the additional software (Logitech Gaming Software) to go with it and everything seemed to work fine. After a few days, the bouncing around started happening again. The light on the mouse would turn on and off by itself.

I've tried plugging my mouse in a different port but that didn't seem to fix anything. Right before I wrote this, I plugged my external Seagate HD in to backup and my mouse jumped around worse than it's ever been. Once the harddrive was plugged in long enough and about halfway through the backup, the mouse went back to normal.

This to me sounds like a power issue to the USB ports.

So long story short, to me, this seems like either a hard drive issue or a power issue. I have not tried uninstalling the Logitech software to the G502, I never installed my old mouses software.

I also have a Razer Deathstalker keyboard with Razer's Synapse software installed. But the jumping around happened prior to having both softwares installed so it can't be a software issue.

Sorry for the ramble, hope this is enough information for you.

OSX 10.10.2
27" iMac Late 2012
3.4 GHz Intel Core i7
16GB 1600 MHz DDR3
1Tb Fusion Drive
NVIDIA GeForce GTX 680MX 2048 MB
(Apparently my serial number is unavailable)
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Old Mar 18th, 2015, 03:52 PM   #2
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What happens when you use the Apple Mouse or Apple Trackpad that shipped with the iMac?
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Old Mar 18th, 2015, 03:55 PM   #3
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My first test to do some diagnostics and testing would be to shutdown and then boot up into Safe boot Mode and see if things change.

Press and hold down the shift key immediately you hear the boot sound to use Safe boot Mode.
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Old Mar 18th, 2015, 04:24 PM   #4
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See the problem is, it doesn't happen all the time. So I could use it for hours and nothing happen. I have boot camp with win7 for playing games and occasionally my mouse would jump all over there too.
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Old Mar 18th, 2015, 06:47 PM   #5
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seems like a stupid point, but is it possible the wireless apple mouse is still paired with the computer and is being touched somewhere? a desk, under papers , your rabbit cage etc? turn BT off and see if the problem persists
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Old Mar 18th, 2015, 07:07 PM   #6
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Actually that sounds quite plausible, and if there's a cat around, no doubt it could be using it, but not quite as plausible, but could sure be making it move.
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Old Mar 18th, 2015, 08:40 PM   #7
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Honest to god, when I bought this iMac I used the mouse for probably 2 weeks and then switched to my G5.

Ive had this computer well over two years now. I still have it, but unless it can turn on by itself I doubt it lol. I'm a student so no pets or anything around. Its been sitting in its packaging for awhile.
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Old Mar 18th, 2015, 10:21 PM   #8
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Hey, try using a different surface for your mouse. Like a cloth mousepad.
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Old Mar 18th, 2015, 10:25 PM   #9
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I switched up to a new mouse pad about a week or so ago, but I don't know how that would effect when things were plugged in and out of the USB port. See all recently, past few hours its been perfectly fine...
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Old Mar 18th, 2015, 10:56 PM   #10
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I think IllusionX actually meant a plain non-patterned or textured mouse pad. Some can cause pointer havoc with some mice.
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