You should restore the firmware of the device.
Please read this user manual especially the content of the page 22:
http://www.teac.eu/fileadmin/project_data/hifi/support/mp3-player/MP-235/Manuals/MP-235_english.pdf To do recovery you will need the CD you had got together with the player. If you have not it now the recovery tool can be downloaded from this website also.
This is here:
http://www.teac.eu/no_cache/hifi-audio/support/mp3-player/mp-235/?sword_list[0]=235
It's name is
Recovery Update ToolThe
TEAC website give good support enough, and I hope your device will work fine again.
gylacz
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