Why can't I play video on my phone?

i have a gravity 3 NO i dont have java turned off i could play u tube videos fine befor but now it says media player being played by another application. its not i dont have any aplications on!!! HELP

yes, the phone accepts 3gp video, but when i convert or put some of my videos my phone wont play it,,ive tried different formats but still i cant crack it...by the way it captures video in .vid format, and its too short,,anyone out there who has a much...

I have a video recorded on my phone.. If i transfer it onto my computer then burn it on to a dvd, could i play it on my xbox in HD? The xbox can play movie dvds in 720p or 1080i... can it play the phone videos in HD? Would i need a certain type of dvd...

I have a Sony Ericson W595 and I am trying to put on it a video file off of my laptop. The file I am attempting to put on my phone is a Mp4 video file, the same as the other videos that I have filmed on my phone. The file I am trying to put it in is...

The file is a .wmv file and my phone has real player... what do i have to do to get it to work?

when i play a video in my ipod video i cant hear anything what do i do?

my new agp video card for an old computer cant play any game now. i recently upgraded form a nvidia 64 mb card to an asus a9550ge/td256m/a.the video card can play videos but not games and my pc runs slower than before what should i do? my configuratinos...

In my computer i install adobe flash player but now i cant play any video in website. i cant see any movie. when i play movie appears a black screen only no sound no video

my phone is a QTV20i duo myphone but when im downloading a video it wont play. I tried the Xvid MPEG-4 (AVI) video format but it only says that the video is invalid video file. can you help mo guyz.. ?? thanks.