Keyboard and Mouse keep dying

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dhaab1965 Author

Level 1

0 points

Keyboard and Mouse keep dying

Dual 1.42 GHz PowerPC G4 with 1.5 GB DDR SDRAM.
Apple Studio Display LCD 17" Monitor
Mouse and keyboard are Apple products that came with the computer

I've owned this machine for about 6 years and have never had any issues. I upgraded to Leopard about 3 months ago and things ran slower, but it still worked. In the last week, my keyboard and mouse will die at random times. Sometimes I have to power cycle the computer twice to get the mouse and keyboard working again. Even then, they quit working after about 10 minutes even after a power cycle. Anyone ever have this issue and know what I might do to correct it? I think it's odd that a keyboard would stop working.

Message was edited by: dhaab1965

Dual 1.42 GHz PowerPC G4, Mac OS X (10.5.3), 1.5 GGB DDR SDRAM

Posted on Jun 17, 2008 8:03 AM

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Answer 1

Jun 18, 2008 7:00 AM in response to dhaab1965

my m7803 keyboard stopped working after moving it, from monitor usb to powered usb. no available keyboard to swap. any suggestions. thanks.
system is a mdd 1.25 g4/10.3.9

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Answer 2

Allan Jones

Level 9

79,790 points

Jun 18, 2008 7:25 AM in response to dhaab1965

Sounds like your USB buses are overloaded somewhere. There are a couple of things to check.

1) Are you using a Griffin iMate ADB-to-USB adaptor to connect any older ABD keyboards or graphics tablets? I was, and I started having trouble when I moved to Tiger. Griffin says the input code changed at the system level and they cannot fix, stopping the iMate support at 10.3. I ask because when I got to Tiger with my iMate, I had sudden and unpredictable dropouts where no USB input device worked until I restarted.

2) Are the keyboard/mouse connected through any USB ports on the display (can't remember what the Studio display has). If so, connect directly to a logic board USB port.

3) Do you have any unpowered USB hubs in the system? Those often fail to provide enough power to keep the signal up.

4) Dismount any USB flash drives and see it that helps.

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Answer 3

Jun 20, 2008 5:34 AM in response to Allan Jones

Allan Jones, It seems that I have moved my USB keyboard from the LCD Monitor to a USB powered hub, without realising that the monitor hub was supplying 100Ma, as opposed to a higher output from the powered hub. Result : Keyboard no longer working.

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Answer 4

Allan Jones

Level 9

79,790 points

Jun 20, 2008 6:48 AM in response to josephpap

500mA seems to be the standard for hubs and even the "weak" keyboard port on mine shows 220mA (checked with system profiler this morning). I think something else is afoot.

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