LG 4710 Will only play cds and not dvds it has been hacked to play all regions and on screen it comes up with check disc on all regions and all discs any help !!!
The 4710 has a switch on the back for PAL/NTSC/AUTO. Setting it to NTSC will cause PAL discs to display 'check disc'. However, NTSC Region 1 discs should be okay as long as the player has been correctly hacked (ie. set to region 0 or region 1).
Other than that, I'm afraid I can't think of anything else...