1) Do you full wipe your Xoom before installing CM9?
2) Try as grant suggested:
A soft reboot, press and hold the power button and the volume up button together until the Xoom starts to reboot, then release them both and see if that helps.
If failed:
- Reboot recovery
- Wipe cache and dalvik cache
- Reboot and try again.
Still failed:
- Reboot recovery
- Wipe cache, wipe factory data and dalvik cache
- Reboot and try again.
Failed again:
If failed:
- Reboot recovery
- Wipe cache, wipe factory data and dalvik cache
- Flash LTE rom and GApss again
- Reboot and try again.
If all didnt help, sorry im 3G Xoom only..need to ask Steady or Team Rogue about this.
EDIT: After you try all above not working, you're not alone. Steady will fix it soon: here
Quoted from Steady @ XDA

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