I haven't tried this yet on my new C1000, but it always worked on my C760
1. Unplug Zauarus from ac adapter
2. Remove battery from zaurus
3. Count to 10 slowly, now count to 10 slowly again as you probably counted too fast the first time
4. Hold down the D+M keys with 1 hand
5. While keeping the D+M keys pressed, plug in the ac adapter
6. Count to 10 again, before you finish the Diagnostic/Maintenance Screen will appear
7. Release D+M keys and replace battery
Hope this helps
Stu