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rjmoeller

14 Posts

16173

January 19th, 2007 19:00

Optiplex GX280 usb keyboard & mouse failure

I have a user who keeps having failures of the usb keyboard & mouse on her GX280. I have replaced the keyboard and mouse twice. I have had Dell replace the mother board. I then replaced the whole computer. I have disconnected the usb hub on the FPv1704 monitor she is using. I put the whole system on a surge protector. I put the whole system on an ups. She is still having random failures of her mouse and/or keyboard. I did find that for some reason the laser printer she has was hooked up both locally through a parallel cable and on our tcp/ip network.
Could the double connection on the printer be causing these random failures or should I keep looking towards power?

ManyDimensions

1.3K Posts

January 20th, 2007 07:00


rjmoeller wrote:
I have a user who keeps having failures of the usb keyboard & mouse on her GX280. I have replaced the keyboard and mouse twice. I have had Dell replace the mother board. I then replaced the whole computer. I have disconnected the usb hub on the FPv1704 monitor she is using. I put the whole system on a surge protector. I put the whole system on an ups. She is still having random failures of her mouse and/or keyboard. I did find that for some reason the laser printer she has was hooked up both locally through a parallel cable and on our tcp/ip network.
Could the double connection on the printer be causing these random failures or should I keep looking towards power?
In short, yes.
 
We found that if the USB mouse and keyboard are attached side by side next to the Ethernet Lan connection, USB failures abound. I don't know the reason, but we verified this several times in our lab. If your connections are stacked in this order: 
 
U E
U U
U U
Where U=USB and E=Ethernet
 
The keyboard should be next to E
The mouse should be on the other stack.
The USB printer (if connected) can reside next to the keyboard but not the mouse.
 
I don't know why, I just know this worked for us.

Rich_C

17 Posts

July 25th, 2007 07:00

Am trying this configuration to see if it cures the no keyboard & mouse on reboot problems I'm having on my Mepis (Linux) system. I have: K E B P - M K = Keyboard E = Ethernet B = Bluetooth P = Printer - = Empty M = Mouse Hope it works!

Rich_C

17 Posts

July 28th, 2007 10:00

Seems to have worked! Sorry about the rubbish formatting in the post above. Some line returns got ignored I think!

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