Wont play any videos

Hi: 

my TV Live suddenly stopped playing all videos. Doesnt matter what the format is. It wont play videos that it played just the other day. Everytime i select a video it tells me that the format isnt supported. 

the only thing different that i’ve done recently was that i disconnected the harddrive from the TV Live to connect it to my laptop to load a new video on it. 

I’ve never updated the firmware on it, and its never been connected to the internet.

The hard drive is fine and it plays videos on other devices such as my laptop. 

can anyone help me out? 

thanks

Did you eject the drive before disconnecting it from the unit?if not, you might want to try and run a scan disk on the drive to fix any file errors