If it won't start up after you let it sit, you can try the below from the JB3 FAQ's:
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http://taperssection.com/index.php?topic=16338.0-
It's probably a good idea to do a Format All regularly to ensure you don't run into problems like excessive fragmentation. Instructions:
1. Remove the battery or press the reset button.
2. Either while reinserting the battery or after reset ensure that the stop button is held down.
3. As soon as the 'Creative' logo appears on the screen during the boot sequence, release the stop button. Immediately press and release the play button. The unit should boot to a diagnostics mode with several recovery options.
Those are:
[a.] Clean Up (Performs a scan disk on the HDD)
[b.] Format All (*WARNING* ALL contents will be lost, including pre-installed content)
[c.] Reload OS (*WARNING* THIS IS AN ADVANCED OPTION. DO NOT choose this unless you are sure of what you are doing as you could render your player unusable. You must also have a suitable firmware file on your PC for reloading via USB)
[d.] Reboot
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Todd