I did experience a similar issue with my Rega, the problem was apparently associated to the ribbon cable connector to the laser, although it had been opened several times for various 'enhancements' which quite possibly contributed to the inability of the drive to recognise the presence of an inserted disc.
The solution is very simple, take it to an authorised Rega service centre who will, (assuming that the issue is in fact as noted above), replace the entire laser and ribbon cable assembly which is a simple, quick and quite low cost job as the mechanism is a rather rudimentary and inexpensive Sanyo component.
I found the result was a HUGE improvement in all aspects of the players performance (even prior to it becoming noticeably selective of which discs it would play) !
YMMV, however I feel that this machine is well worth spending a reasonable amount of money on to repair or 'enhance' ;-)
The solution is very simple, take it to an authorised Rega service centre who will, (assuming that the issue is in fact as noted above), replace the entire laser and ribbon cable assembly which is a simple, quick and quite low cost job as the mechanism is a rather rudimentary and inexpensive Sanyo component.
I found the result was a HUGE improvement in all aspects of the players performance (even prior to it becoming noticeably selective of which discs it would play) !
YMMV, however I feel that this machine is well worth spending a reasonable amount of money on to repair or 'enhance' ;-)