I use my old trusty Plextor 12/10/32a. Recently I started to have some problems: when I insert any media I hear a strange sound like a CD hits something (it behaves this way with all CDs: CD-R, CD-RW, and original game CDs), also the green light flashes even when CD is not inside.
If your drive is no longer under warranty, it may be time for an inspection/cleaning. It sound like you may have something loose or a foreign object in the burner. (This reminds me of the guy who used his burner tray for an ashtray, then accidentally closed the tray while watching the burner swallow his cigarette ).
If the green light keeps flashing, maybe some insects are dancing to a disco beat.
Seriously, blinking green lights can be an error code. See the information at TROUBLESHOOTING: Blink Codes for the PlexWriter 12/10/32A