I have had this on a number of other players. First try the disks in question on another DVD player after giving them a thorough clean. If they work there then you know the problem is not with the disks.
After that (assuming the RH299 is actually working in every other respect e.g. on HDD), run a laser cleaning DVD/CD in the machine to clean the laser lens. If your machine is out of warranty then you can try opening it and cleaning the laser lens with rectified spirits/pure alcohol. Then try the disks again. If they still don't play, then it's off to a local electronics expert to see if realigning or replacing the laser and transport mechanism is economically viable, or buy a new machine.
We had the same problem where disks were being 'spat out' as "unknown". Took it to an LG...
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We had the same problem where disks were being 'spat out' as "unknown". Took it to an LG Service Centre, got it repaired under warranty, but now it's happening again! Not happy, complained to LG, but I don't think they'll do anything!
when a disc is put into the recorder it comes up with a message (unknown disc) and ejects it. I am...
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when a disc is put into the recorder it comes up with a message (unknown disc) and ejects it. I am trying to play dvd movies rented from bigpond, used to work ok but now ejects disk and error unknown disk is displayed on screen .will play other dvds with no problems.i have tried bigpond dvds in other player and they work ok jake.
my one year old LG DVD/VHS recorder has decided not to play any burnt DVD's they freeze and the...
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my one year old LG DVD/VHS recorder has decided not to play any burnt DVD's they freeze and the picture breaks up.But it will play commercial DVDs I have tried to clean the lens with a commercial cleaner but the disc will not "play" have I bought a lemon ?