m250 need help

i bought an m250 deciding it was good value for money and it got good reviews. ive had it about 1 week maybe a bit more. today i was listening to a song and it went off all of a sudden. i thought maybe the battery had died so i changed it. it still wont turn on…it turns on when connected to the pc and is in MSC mode.

the player wasnt hit or knocked, it simply turned off of its own accord; really frustrating.

any help is much appreciated.