alba portable dvd player?

Hi,
I have just bought an Alba dvdp722 portable dvd player and when I try to play a dvd disc it says 'disc unavailable'. Region was set at 2 and I have changed it to all regions and same thing happens - it sounds as though the disc is not spinning although I can play CD's. Is this an error (should i take it back) or is it something can easily fix?
thanks
Cat