This problem is down to failure of the laser and an only be solved by replacing it. Samsung are aware of this fault but will only offer a free replacement if the unit is still covered by it's warranty. They do offer a replacement service but charge £94 for it.
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Each DVD player is assigned a code for the region in which it's sold. For example USA/Canada are Region 1 players. DVD players will refuse to play discs not coded for its specific region. In effect, this means that a DVD purchased in one country is normally unreadable on a DVD player bought in another region.
If your rental DVDs work in the player then there is nothing wrong with your DVD player. If you have purchased DVDs that do not work the problem is with the DVDs you have, not with the DVD player.
Standard DVDSs are read by a red laser while blue ray DVDs are read by a blue laser (hence the name). The blue laser diode is likely to be faulty and therefore standard dvds work but blue ray dvds do not. This is not an easily obtainable or replaceable part.
I my DVD-HR735 wont recognise any discs at times, and is getting worse. I've now discovered (out of frustration) that if I tip the front up to between 30-45 degrees, it will play all the discs it says were unreadable. I've started jamming three dvd boxes under the front of the machine when i want to play dvds.
My Smasung DVD/VCR Combo stopped reading DVDs because of a dirty read head. It started by only playing disks sometimes, and progressed to never playing disks. I assumed it was a dirty laser lens so I bought a lens cleaner set. Unfortunately my player wouldn't play the cleaner disk.
So I took it apart and cleaned the laser lens manually with some isopropyl alcohol (the clenser that came with my cleaning disk), and a lens cloth (that came with my glasses). Just open the case (starting with the screws in the back) and remove the snap in cross panel that obscures the lens of the DVD portion. Put a drop of cleanser on the lens and gently wipe it with the cloth.
Oh and by the way, I take no responsibility if you break your own player while following my instructions. My own DVD player was far out of warranty at the time I cracked it open.