Not working

My san disk clip jam  bought in February this year is red by my PC and I can transfer music but When I turn it on bottons are stuck and do not work and I cannot listen to music. I tried with press and holding the power off for 20 seconds but nothing happens. Can you help me?

Try manually re-applying the firmware:

http://forums.sandisk.com/t5/SanDisk-Clip-Jam/SanDisk-Clip-Jam-Firmware-1-12-Download-and-Installation/td-p/358899