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Imac KB/Mouse disappears

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by paul.beaudoin

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Folks,
I have an Imac (V9.x with updates) that constantly loses the KB or Mouse or both. The system appears hung but the fix is to unplug the KB/Mouse, waqit a sec and plg it back in. Suspect the driver is AWOL and the USB reacqyuires it upon unplug/plug. Any advice gratefully received

3 replies

by guruofdos

Sounds like a mainboard/psu problem! The USB ports on Macs (and PC's) can only supply of the order of 120mA or so, and the Mac daisy-chains the keyboard and rodent together. Sounds like the USB port is borderline faulty or one or other device is drawing a LITTLE too much current for the port. Try using each USB device in a separate port, or trying them on a different Mac to eliminate them as the problem.

by paul.beaudoin

Dear Guru,

Seems to have solved the problem. I have a USB hub and changed the arrangement such that the KB and mounse are not chained. Seems to have solved the problem.

Many thanks (You get the points!)
Paul

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