No disk in Drive

[qanda]This thread is about the Lite-On LH-20A1H. Click here to see full specs[/qanda]I’m having problems with writer not recognizing dvd in disk drive. Some dvd’s work fine, while others don’t work at all!! The ones that don’t work say there is no disk in drive. I have updated the firm ware twice, and still no fix. This writer is an add on, as original writer failed. I noticed that the current region is Region 1, should I change this to USA or North America? Need advice