Daniel,
Yes, I didn try the thread in #4. In speaking with Sony tech. support, they advised to do the same. I additionally tried enter 1, enter 2, and enter 3 with no avail, as they also stated that would be the set-up for DVD1, DVD2, or DVD3. The remote that I have now is RMT-D240A, which was purchased new, with new batteries installed. In speaking with Sony tech. support, they advised that is the correct remote. After troubleshooting with them on the phone, without success, they advised to send the DVD player unit in for repairs.