My computer plays movies off my external hard drive but without picture.

[Amanda J9]

When I am watching a video from my external hard drive, the sound plays perfectly but there is no picture. Just the graphics as if you were listening to music off windows media. Help!

 

[ksiemb]

When I am watching a video from my external hard drive, the sound plays perfectly but there is no picture. Just the graphics as if you were listening to music off windows media. Help!

System specs - Video player - file format - Codec's ?