You guys rock!
I cleaned the drive with alcohol thanks to the clear instructions you linked to and my 716 has so far burnt off 5 of the disks it would not previously touch without an error.
I can only find verbatim cd’s locally so far but am still looking.
I did have an error while trying to burn the dual layer blank it had previously rejected but this was an alcohol 120% error (or a general software one) rather than anything obviously to do with the plex. The disk got burnt but shows as blank so I will need to get more to test - would datawrite dual layer +R’s be of sufficient quality to test?
In case it is important here is the error message I got;
I did find a second hand 716-A in a local shop - what would be considered a reasonable price for it? They are asking Â£28 and claim they can’t negotiate on the price.
Thanks again for all your help.