Hi I purchased a Samsung DVD reader/writer to replace an Asus Combo drive that decided it didn't want to read DVDs anymore. My problem is that it isn't playing nice with my Sony DVD reader/writer. I can put the Samsung as the Master and the Sony as the Slave and both check out in bios and come up in My Computer but the Sony won't read DVDs but will CDs. If I put the Sony as the master then it won't work "invalid application" error but the Samsung will read DVDs as a Slave. The Jumpers were set to Master/slave (or "cable select" but didn't change anything) as per where they were so I don't believe that is the problem. The Sony was the Master with the Asus and it read DVDs fine then but now only works as slave. Thank You for any help.