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Old windows computer won't recognize mouse or keyboard

Posted on 2013-11-02
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Last Modified: 2013-11-08
I have a 4 or 5 year old secondary computer that will not recognize a mouse or keyboard. I'm using a CablesToGo 4 port switch to toggle between 3 computers. This switch has PS2 input connections with USB outputs. The other 2 computers work fine so I know it's not the keyboard or mouse. Have tried disconnecting the switch and attached another USB keyboard and mouse and the computer will not recognize them either. I have tried tapping the F8 key on bootup but no luck there either.  Since I have user passwords, the system gets to the login screen and no further.

Thanks for your help!
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Question by:pabrann
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by:CompProbSolv
ID: 39618973
Have you tried a PS/2 keyboard and mouse directly connected to the computer?

There is often a setting in the BIOS with regard to USB settings ("Legacy" is a common setting) that will make a USB keyboard and mouse more likely to be functional.

As with many troubleshooting issues, this needs to be done in steps.  Start with PS/2 keyboard and mouse, then USB keyboard and mouse, then the KVM switch.  Otherwise, there are too many variables to deal with at once!
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by:pabrann
ID: 39618996
Thanks for your input. The computer doesn't have PS2 connectors. The keyboard and mouse hooked to the KVM are PS2.
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Expert Comment

by:rindi
ID: 39619005
Have you tried all the USB ports on the PC? some only support HID devices on certain ports.
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Accepted Solution

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pabrann earned 0 total points
ID: 39619034
Hey, that worked. I disconnected the KVM usb cables, hooked up an external USB mouse and keyboard to the same USB port on the computer and it worked. I then, disconnected those and tried the KVM connection and it did not work as before. So, somehow the PS2 connection is not working on this computer. Can you think of any way to try to reestablish connection through my KVM?
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by:CompProbSolv
ID: 39619185
I would have expected that the KVM switch presents itself to the PC as if it is a standard USB keyboard and mouse.  It sounds as if it is not doing a perfect job of that.  Other than trying other USB ports on the computer (as suggested by rindi) or on the KVM switch, you may not be able to use this switch with this computer.
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Author Closing Comment

by:pabrann
ID: 39629700
Excellent, my major problem is solved. At least I can use this computer independently of the KVM switch.
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Expert Comment

by:CompProbSolv
ID: 39631079
Connect the KVM switch and a USB keyboard and mouse to the computer and take a look at Device Manager.  You may identify some odd driver issue there with the switch.  It will show up with a red or yellow mark if this is the case.
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Author Comment

by:pabrann
ID: 39633587
I will give that a try. Thanks for the additional info...
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