Troubleshooting and Fixing Computer Lock ups
Some computer motherboards still ship with older PS/2 ports for keyboards and mice. Developed for use on the IBM PS/2 computer, this is one standard that just won’t die. Clearly, USB connectors have completely replaced and made obsolete the PS/2 standard.
Unlike USB ports and devices, PS/2 ports and the keyboards and mice that connect to them were never intended to be hot swappable. This means that you are not allowed to swap out one PS/2 device for another one (such as unplugging one keyboard and plugging in another) without shutting down the computer first.
Sometimes your computer or operating system won’t balk if you do disconnect and reconnect a keyboard or mouse to a PS/2 port. However, doing so can cause a computer to lock up or become unresponsive to further inputs from those devices.
Check the back of your computers connected to the KVM switch and see if they are connected to any PS/2 ports. If they are, this may be the cause of the lock ups.
Luckily, there is a quick and cheap fix to this problem. You simply need to purchase a PS/2 to USB adaptor for each of the components that connect from the KVM switch to the PS/2 ports on your computers. These adaptors typically cost only a few dollars each (US$) so you can avoid having to buy a new KVM and see if that one works better.