Article ID : S500006934 / Last Modified : 11/04/2018

Problems encountered when using external mouse from COM2.

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I can use COM1 on my system for my mouse without any problems, but when I try to use COM2 I experience errors, lockups or other problems

The COM2 Port is used by the Modem.
This is most likely a resource conflict of some sort, especially with a modem. COM1 usually works more often than COM2 because many modems come preconfigured with their own COM2 on board, which usually conflicts with the built-in COM2 on the motherboard unless you remember to disable it.