Pardon me if I put this thread in the wrong place. Being new, I'm just alittle lost!! Anyhow, I had this 'incorrect function' when trying to get my Sony DRU-830A to read a DVD. It would read a CD just fine, but it kept throwing up that 'incorrect function' error when I tried to play a DVD. I tried eveything I knew too do and followed the instructions in a similar post on this forum, but with no luck. However, I did find something that did work. After about 2 hours of trying every trick in the book, I cleared the CMOS. I took the battery from the motherboard and left it out for about 5 minutes, and when I re-installed it and re-booted, the DVD player worked perfectly!! Granted, this may not work for everyone, but if you're to the point where this problem is getting on your last nerve...it may just help. Sure, I had to reset some of my settings in the BIOS, but it was well worth it!! Hope this will help someone!!