lg optimus black

my lg optimus black isn't working properly lately.
and the on button doesn't work
my first problem was that it wouldn't let me put any music from my computer on it,
now my second problem is that the on/off button wont work.

my phone turned off, and i have no way of turning it back on.


Wow, other than suggesting you take the phone for a diagnostic test... you could try to reset it (if that is possible). (Btw) Welcome to the forums.

I'm not sure of how much help you might get over @your device's area of support with this problem, but it might be worth a shot. Choose your device from the list home-page and check in with the other users of this device.

All the best.