On page 45 of the user manual it says this:
Both the HDD & DVD RECORDER and the discs are coded
by region. These regional codes must match in order for the
disc to play. If the codes do not match, the disc will not play.
The Region Number for this HDD & DVD RECORDER is
described on the rear panel of the HDD & DVD RECORDER
If you changed the region codes on your player it will not work. They should be set back to 1 or whatever your model says on the back of the unit.
If this unit was purchased outside the United States, it may not work in the United States.
Here is a copy of the manual if you need it:
http://downloadcenter.samsung.com/content/UM/200506/20050618115856781_HR720-00758C-XAC-Eng_0519.pdf
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