Please consider the device. IT DOES SUPPORT MP4. The display does not do anythin as the screen resolution is way under what any modern content is created in. No one creates any video of less than 480p!!! This device was placed into the market in 2010, that makes it a nine year old mobile device!
Nokia's mobile phones generally support playing MP4 format, MP4 video can not play, it may be MP4 format has many different encoding, even if the suffix name is the same, the encoding is not necessarily the same. And your machine generally only supports some kind of encoding, so the encoding does not match and the display can not play. Recommend you use the Dumpmedia Video Converter, free to download, it supports many formats including mp4 format.