Richyboy1989 , as jo mentioned, it is very likely that your player was hacked. In most cases, by storing files above the actual capacity it would increase the chance of firmware corruption and disabling the player. As these files are stored over the firmware area.
Your solution now is to do a Dead Player Recovery, guide here
http://www.mympxplayer.org/dead-play...ide-vt567.html
to attempt to reboot the memory chip.
Also, you'll need to check for the processor's serial number (eg ATJ2085, ATJ2097, etc) to be able to locate a possible group of firmwares.
At the same time, you can identify the memory chip's real capacity by looking for the serial number, they are usually either Samsung or Hynix brand.