Hi, i've recently purchased a new home cinema installation, consisting of a AVR 8500 receiver and two DVD players, being the DVD20 and DVD30 (all Harman Kardon). The DVD30 i got along with the AVR 8500 (bought all 2nd hand) and according to the seller it worked fine with DVD's, yet had some problems with CD's. Required open/close the tray several times until at some point it'd read the disc, then it'd work fine. Now it stopped reading basically everything, makes a hacking sound inside (mechanical). It used to do that with CD's at start, when DVD's still functioned, but now as said it does so on nearly everything. I wonder if this can be attributed to something like dirty lens or prisma, or if it means there's electronical problems in decoding signals? Anybody who's had similar problems and knows if it's possible to fix? Or how much it costs to hand it in with H/K? I'm 100% sure the discs itself are fine, as they work flawlessly on my JAMO bedroom set (which has a KiSS dvd receiver as player, and reads virtually EVERYTHING). Thanks for any advice/information.