BB Bold 9000 :: None Of Videos Play Anymore .mp4 / .mov / .avi / .3gp?

so i've been reading the forums and googling and whatnot, and i found out that my blackberry should support: .avi, .mp4, .mov, and .3gp video files. video files are currently .m4v because of itunes, but i renamed a test video to the 4 above (unless i'm supposed to fully convert them?!), and none of the videos worked. i've tried uploading with media manager, as well as simply dragging and dropping onto my memory card. before, i was able to drag and drop my files onto the memory card, and the videos would play perfectly (i never even had to change the extension!)(also related: i've never been able to play Internet videos!) note: i uploaded a video i took from my point-and-shoot camera (.avi), and there was only sound!