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Sounds like its either low on power or the memory in it is to full to operate. To check the power issue does the unit run on built in batteries that need charged or is it a fixed ac power unit that plugs into the wall? If it plugs into the wall ensure the plug os securly connected both to the unit and inyo the wall receptacle too. If its a built in re-chargeable unit plug your charger into it for at least 6 hours and then try using the unit again if it doesnt shut down this time it was a low battery; however if it still shuts down try removing 3 -4 of the longer or bigger music files from it and then try using it again and see if it shuts down. Hopefully this will help somehow.
try to unlock it or reset it there shoulb be a very small hole on the back of it use something to put in there to reset it i try it i dont relly know if i works it justsomething i got off a website but i have delete all of the files off of mine and now it give me some problems because i delete my factory setsing or files so do NOT!! delete the files.
The Proline manual (comes on a CD with the player) says:
6.3.7 Key lock
This function sets a time delay from when key lock function is started or the player is switched on, after which the player will automatically stop responding to the control buttons. Pressing any button will then display the message ‘Locked’. Key lock is useful, for example if you put the player in your pocket and don’t want any buttons to be pressed accidentally. The time delay is to let you start playing the music and so on. You can choose a delay of ten or thirty seconds, one, three or ten minutes, or you can disable key lock completely. •
Press and hold the V+ button for a couple of seconds to temporarily unlock the keys.