[quote=Rileyrott;2021922]Noob here. I am having the same problem with scanning a disc on my Plextor PX-760a with Nero Speed 188.8.131.52. The Quality test start box is greyed out and yes I have selected the Plextor drive. Ant thoughts?[/quote] Plextor drives are not supported for quality scanning in CDSpeed.
You will have to use PlexTools Professional (LE or XL) for quality scanning on your Plextor PX-760 (or PxScan/PxView but that will require using unofficial command-unprotected firmware).