Page 1 of Maybe not a hacking or chipping issue - Sony DAV300???

I live in Indonesia and bought a multi-region Sony Home Theater System about 2 years ago. Not sure of the exact model number right now (something like DAV300 or DVS310). I didn`t seem to have much trouble playing the black market DVDs that are sold here - at least until a few months ago. Now, about 80% of the DVDs don`t play. Sometimes the message "No Disc" appears in the window of the unit, sometimes numbers flash on my tv screen, sometimes it will play for a little while, then stop. I understand Sony DVD players can`t be hacked, but can be chipped. But, since this is supposed to be a multi-region player, maybe its not a hacking or chipping issue? Also, what if I buy a simple DVD player that seems to play local DVDs more reliably - can I connect that DVD player to all the great surround speakers of my Sony system?? Thanks!!