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seveej

macrumors 6502a
Original poster
Dec 14, 2009
827
51
Helsinki, Finland
Ladies and Gentlemen,

I'm having a weird issue, and have not found anything online which would help me explain the problem. I hope someone here will be able to help me troubleshoot/resolve the issue.

Gear:
MBA 13" i7 (early 2014)
- external mice (magic 2 and wired logitech)
- external keyboard (Apple, wired)
- external display (23" ACD)
Sierra (10.12.3)

Symptoms:
- All input channels become unresponsive.
- Typically this happens so that the first which is dropped is the external mouse, thereafter the external keyboard, finally the built-in trackpad and keyboard stop functioning as well. There is usually a lag of about 10 seconds from the first unresponsively until all input devices stop functioning.
- the computer does not stop functioning (music and video continue to play, menu meters and clock keep updating, it even recognises if I disconnect/connect my BT mouse), but mice and keyboard will stop "working".
- Nothing indicative showing in console/logs. No crash reports.

Problem is resolved by:
- Hard reset (power button for 10 secs)
- Problem will occur again.

Qualifiers:
- Has thus far happened only when connected to external stuff (mouse, keyboard, display).
- Has started occurring only since I updated to Sierra (update, not clean install).
- All external devices in question are unproblematic when used with other computer, and were unproblematic before upgrade to sierra.

Severity:
- supremely annoying,
- not fatal (no data loss yet, plus once the ext-mouse becomes unresponsive, I have a couple of seconds to save stuff)
- Indicative of wider problem?

I've had this MBA for a couple of months, and have been very happy with it otherwise. I initially bought it for travel/coffeeshops, but have since used it as my main workplace computer.

Have tried:
- disk first aid
- disconnecting&reconnecting external inputs
- NVRAM reset

Have not yet tried:
- SMC reset (Error type not indicative of SMC reset, but will try that next time a hard reset is neccessary)
- Clean install of Sierra (Trying to avoid wasting half a working day)
- Roll-back to Yosemite (I'm no fan of the bleeding edge, but I was forced to replace my magic mouse with a MM2, which necessitated the upgrade to Sierra)

All (non-troll) comments appreciated.

RGDS,
 
Not same as you but my 2009 and my 2010 macbook sometimes on boot does not see the keyboard and mouse.

A reboot usually fixes it.

rather annoying.

however clean install on my macbooks.
 
Option + Command + P + R through no less than two Apple Chimes at startup, Parameter RAM NVRAM Reset.
See if that has any affect

IF/THEN/ELSE

Check your %user%\Library\Preferences\com.apple.safari.plist files. There ought to be two, Safari and Extensions, possibly a third for iCloud push.
Delete any rogue plist files for Safari
 
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