Q: Why is my keyboard generating spurious input?
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Aug 7, 2015 10:23 AMby Nubz N.,Hello WuLi,
The symptom you describe of the cursor moving randomly or maybe a window popping up makes me think of the trackpad rather than the keyboard. If it were the keyboard I would expect random characters typed.
Please check out this article and see if the symptoms and solutions are there.
Trackpad or Magic Trackpad is jumpy or erratic - Apple Support
All the best.
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Aug 7, 2015 1:31 PMby WuLi,I don't use the track pad -- it's definitely the keyboard.
When I'm typing, the cursor will jump to a new line, or insert what I'm typing in a previous line.
While typing, a window will suddenly pop up, as if I've a pressed a Command - Key combination (see photo).
Driving me crazy!
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Aug 8, 2015 6:48 AMby Nubz N.,Hi WuLi,
Although it does seem to be the keyboard you may still want to isolate further.
I would start by enabling the Keyboard Viewer and keep that open to monitor if random keys do seem to be activated causing the issue. See the section "Keyboard has one or more keys that don't respond" in Troubleshooting wireless mouse and keyboard issues - Apple Support
Also test in Safe Mode or maybe with another user account to isolate software conflicts or issues.
OS X Mountain Lion: Start up in safe mode (Applies to Snow Leopard as well.)
How to test an issue in another user account on your Mac - Apple Support
And if you have an external keyboard to use, you could test with that.
If it does turn out to be the keyboard physically, it would need service.
Apple - Support - Product Selection
Take care.
