Hi, Kodrei!
Thanks for reaching out to Microsoft Community and posting your concerns. We are sorry to learn about your Wireless Desktop 900 keyboard that stopped working, even if the mouse is fine. Thanks for taking the time to let us know about this and allowing us to help you out. As you outlined the steps you took, I believe you already went to this page to help Troubleshoot problems with your Microsoft mouse or keyboard.
The USB transceiver works fine since it allows your mouse to function. I am afraid this is a hardware issue on the keyboard itself. Kindly check with the Microsoft Supplemental Parts for replacement options:
- United States: (800) 360-7561, Monday through Friday, 5:00 A.M. to 7:00 P.M. Pacific Time.
- Canada: (800) 933-4750, Monday through Friday, 5:00 A.M. to 7:00 P.M. Pacific Time.
- TTY customers: Contact Microsoft at (800) 718-1599, Monday through Friday, 5:00 A.M. to 7:00 P.M. Pacific Time.
This may not be the message you wish to read, we hope to have helped you out on how this can be addressed accordingly.
Kind regards,
Janette_Z