![]() ![]() The first few swabs were dark when I was finished. I removed the whole ribbon cable from its ZIF connector and peeled off the stickers and took a cotton swab dampened by rubbing alcohol and swabbed the ink off the bus. Removing the battery may just lower the temperature in that area, masking the symptoms. I would be skeptical of anyone telling you its a swollen battery without you inspecting it. The part of the battery that sits beneath the trackpad is encased in fairly thick battery. I suspected a swollen battery, but mine was fine. It seemed to be causing an interference along the top of the trackpad. Add a little heat from the adjacent battery and its ink can be deposited onto the bus.Īs I'm sure you've now guessed, this is what happened to me. If a little drop of liquid gets in along the top of the trackpad, it can travel down the ribbon and to sticker. That little sticker (pictured) was sitting flush against the center bus on the trackpad chip. Make a "Genius" appointment at an Apple Store to have the machine and/or external trackpad tested. If the cursor movements stop at once, you should suspect an intrusion.ġ0. If none of the above applies, or if you have another reason to think that your computer is being remotely controlled, remove it from the network by turning off Wi-Fi (or your Wi-Fi access point), disconnecting from a Bluetooth network link, and unplugging the Ethernet cable or USB modem, whichever is applicable. There's also a report of erratic cursor movements caused by an external display that was connected but not turned on.ĩ. If you're using such an adapter, disconnect it and test.Ĩ. There's a report that a (possibly defective) Thunderbolt Ethernet adapter can cause the built-in trackpad of a MacBook to behave erratically. The battery must be replaced without delay.ħ. If you have trouble clicking the trackpad, this is likely the reason. A swollen battery in a MacBook Pro or Air can impinge on the trackpad from below and cause erratic behavior. If you're using a Bluetooth trackpad, investigate potential sources of interference, including USB 3 devices.Ħ. Reset the System Management Controller.ĥ. If you booted in safe mode and there was no change, go on to the next step.Ĥ. If you can't boot in safe mode, do the same. If you don't have the problem in safe mode, but it comes back when you reboot as usual, stop here and post your results. Boot in safe mode and test, preferably without launching any third-party applications. Disconnect any USB input devices that you aren't using.ģ. Open the Bluetooth preference pane in System Preferences and check for unknown or forgotten input devices. Follow the instructions in this support article.Ģ. Take each of the following steps until it's resolved.ġ. There are several possible causes for this issue. ![]()
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