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When you don't charge your PDA's battery for a while, and let both normal and backup batteries to finish completely, all your data in your PDA is lost, and it will go back to factory default state. As the operating system is stored in the ROM of your PDA, it will be reinstalled when you charge it again, and becuase there's no data left from the past state, you have to do all the settings again from the start, beginning with the screen alignment (You can tap carefully on the plus sign each time it moves). If you had a backup syncronized with your PC, you can then recover your data to your PDA.
Hi there. I have the same problem with my O2 XDA IIi. But I found that inserting the power adaptor in and out brings back the volume and all is fine for a few hours. The problem could be a power socket or the audio jack. Either one could be broken and may need replacement. Good luck.