I tried to copy a Hard Drive recording to CD a month ago but it failed and ever since I haven't been able to play DVDs or CDs.
I have a Panasonic DMR-EX78 DVD player/recorder. If your Panasonic DVD recorder was manufactured after the firmware was released and the firmware update has already been installed. The firmware for your Panasonic DVD recorder may not need to be updated even though a firmware update has been released - for example. The Panasonic DVD recorder will first display 'PLEASE' and 'WAIT' alternating on the front panel display, automatically turn itself off and then, within a few seconds, restart again and automatically start installing the firmware from the firmware update disc.