by Hard Reset
Motorola XOOM MZ505 hard reset
To reset your Motorola Xoom MZ505 tablet to factory settings and erase all the data on your phone, touch Menu > Settings> Privacy > Factory data reset > Reset tablet.
Perform a factory reset using the settings menu
To Perform a Reset:
1. From the home screen, touch Apps
2. Touch Settings
3. Touch Privacy
4. Touch Factory data reset
5. Check the Erase USB storage box if you would like to erase all content stored.
6. Touch Reset tablet and follow the onscreen instructions
If it didn't solve your xoom problem
See also http://www.hard-reset.com/motorola-xoom-mz600-hard-reset.html using key combo.
Before you buy a new cell phone or new tablet, please try the following procedure to repair your device. First charge your battery, backup your important data if possible and in most cases take out SIM and SD card before factory reset. It is impossible to recover your data after doing a hard reset, so online backup is always important. For all of your data, a backup should be done on an external device, hard drive, raid system or media. With or without insurance, if your cell phone lost, damaged or stolen at least your invaluable data is backed up in a safe place. If you are about to sell your phone and you want to wipe your personal data, or if your phone affected with virus you have to do a hard reset. In some cases, you can delete the forgotten password or lock pattern from your device as well. All information is for devices with stock based ROMs. If you are using rooted device, always back up your EFS folder first, containing your IMEI info, etc.!