Screen froze in Radio recordings setting

http://support.creative.com/kb/ShowArticle.aspx?sid=64004
this is recovery mode, worked on mine.

press the reset button (on the side you need a pen or sharp pencil)

support for ZEN mozaic on the internet

http://support.creative.com/Products/ProductDetails.aspx?catID=213&CatName=MP3+Players&subCatID=214&subCatName=ZEN&prodID=17897&prodName=ZEN+Mozaic

next go to Knowledgebase Solutions
entering the topic "frozen" will give a list of various solutions

when off hold play down. then turn on(while holding play). then theres a recovery menu go to clean up.

press the middle button and the power button for q0 seconds

on the side, near the power slider, there is a small hole. Gently stick the end of a paperclip in there and it will re-set the player.

try this
http://www.anythingbutipod.com/forum/showthread.php?t=10960
If that doesn't fix it try the USB cable

as far as i know no patch is available, but in combination with a laptop and an audio cable (two sides jack) it is recordable (just download a random sound recording program and connect the two with the zen set on FM)

hard drive sounds bad. has it been dropped?
try to do a cleanup

1. Detach the Zen player from your PC , and ensure that the Zen Sleek is turned off.

2. Connect the power supply to the player.
3. Hold down the Play/Pause button while inserting a paper clip into the Reset hole
underneath your player, beside the data/power connector. Keep on holding the
Play/Pause button while you release the Reset button. The Rescue Mode screen will
then appear.
4. After the recovery mode has started, release the Play/Pause button

It will display the following options.
Clean Up Scans the player and removes invalid links from its music library.
Does not affect music files themselves.
Format (All) Caution! Erases all content!
Save a copy of your player's content before formatting.
Reload OS/ Firmware Caution! Erases your player's firmware.
DO NOT select the Reload Firmware option unless you have access to a PC and you have downloaded the necessary firmware to install.
Reboot Reboots the device.

Why does technology make you work for what you already paid good money for? Have you tried going into Recovery Mode? You do this by holding down the Play/Pause button while triggering the Reset button. Once there, you have four options. Try selecting Disk Cleanup and then Reboot. You might need to re-Sync a few things but it's worth a shot. Good luck.