Video Playback / Recording Devices

I HAVE PROBLEM WITH MY MULTIDISC DVD-CD CHANGER, IT'S A SONY DVP-CX860 2003 MODEL,  VERY BARELY USED, WHEN AM INSERTING THE DISK, ON THE OSD TV COMING A SIGN, CAN NOT PLAY THIS SIDE OF THE CD... AM INSERTING IN THE RIGHT POSITION, BUT JUST KEEP SKIPPING, MAKING SOME NOISE, AFTER FEW SECOND EJECTING  THE DISC AND THE "FLIP" ORANGE LED FLASHING.. THE CHANGER ALLWAYS JUST KEEP ROLLING AROUND,  IT IS POSIBLE TO REPAIR??

My phillips DVD player has problems spinning the disc initially, usually in order to fix my problems I do an observatin of "what it did before it was broken" and "what it does now" and from that alone I can deduce the problem area and what part needs to be fixed that isn't working right.. Unfortunately, I never got to see the "what it did before it was broken" part because I could not see what was going on inside my dvd player. This is where I need the experts in this community help.

I recently purchased a RDR - VX525 Sony DVD/VCR Recorder and every DVD  R I put in gets a disk error.  I can play DVDs but cannot put a blank one in to record or dubb a VCR tape.  I am able to play DVD on it but not about to keep a blank disk in.  I have tried all kings.  DVD - R or +  EVEN KEEP purchasing new one.  If anyone has one of these and could help me I would apprecate it.