Files won't play Options

[hrvoje42]

Yesterday it worked normally. Today I put USB with the file in the player and the file won't play. Sometimes is looks just like it's going to play the file, but the screen stays black, and sometimes it just shows that blue circle that means loading and that stays forever, nothing changes. I've tried with different file types (mkv, avi), different USBs, I formatted one USB from FAT32 to NTFS, i reset the device to factory defaults (a few times) and nothing works, the files still won't play. The device is about a year old and it has the latest firmware (which is also about a year old, but there's nothing newer). Does anybody know what the problem (and the solution) might be)?