Article ID: 257514
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After you plug in a Universal Serial Bus (USB) mouse, a yellow exclamation point may appear next to your PS/2 mouse port in Device Manager. When this occurs, the PS/2 mouse port has a status of "Code 24."
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.
Note that the symptom described in this article does not impair the functionality of the mouse.