Hi , Welcome to JustAnswer Thanks & Regards Satchi
Could you please explain the problem little more
all buttons do not work
Are you using a laptp/desktop
which is having the problem ?
May I know what is the model number of the computer having problem?
the computer is not having problem
then let me know the device model number which is being freeze
it is the kindle that is not working
Is it a kindle HD ?
Ok try this
press and hold the power button for 30 sec
Wait until completely turned off then power back on.
thank you it is working
Glad to know that
Positive feedback will be appreciated have a nice day
don't forget to provide positive ratings ...bye bye