Panasonic DMR-EZ17 No Read Error

Hello - I’m getting a “No Read” Error any time I try to insert a blank disc of any type - DVD-R, DVD+R, DVD-RW…didn’t try a +RW or -RAM as I don’t actually HAVE any of those. It refuses to acknowledge the disc entirely, and gives the aforementioned error.

Previously I had the problem with all-discs, however, it did finally start playing store-bought discs today for reasons that are beyond me.

All attempts to put the recorder into self-check mode (via every combination of powering off I know) have failed - it simply refuses to go into the recovery process.

Any help?