What do I do if my mouse is not working properly through the KVM-121/221?

If your mouse is not functional, not detected, or there is a mouse error on boot-up, check the following:

Make sure that the mouse is correctly connected to the KVM-121/221. Check that the green coated mouse cable is plugged into the correct PS/2 mouse port (green colored) and not the PS/2 keyboard port (purple colored).
Verify that your mouse works when plugged into the computer directly. You will have to shut down your computer first to do this.
Read you motherboard documentation and make sure that the PS/2 mouse´s IRQ is enabled. This can be set for most computers in the BIOS setup.
Try a different mouse.
If the mouse movement is random when switching between computers, try shutting down your computer and rebooting.
Verify that your computer does not have more than one mouse driver installed (check your config.sys and autoexec.bat files for windows) and that you are using the latest mouse driver.
If a special mouse is used such as a cordless or scrolling mouse, make sure you use generic PS/2 mouse drivers. A non-standard PS/2 may have extensions on PS/2 protocol that are not supported by the KVM-121/KVM-221.
Do not move the mouse or press any mouse buttons when switching from one PC to another.
Try resetting the mouse by unplugging it from the KVM-121/221 for about 3 seconds and then reconnect.