I have a Sony PCV-RX550 desktop pc with a Pioneer dvd-rom #117r & a Sony cd-rw #crx175e optical drives. Neither drive shows in "My Computer", and doesn't respond when a cd is inserted. The drives show as secondary master and secondary slave in bios (and the cables are attached the same), and both drives are marked by a yellow exclamation point in device manager, but was unsuccessful in updating the drivers. I tried the jumpers set to master/slave & both to CS, but neither made any difference. I did try to run a linux program cd (slax) and it did load and run successfully (which was more confusing!). I would appreciate any suggestions that you have to help resolve this device issue. Thanks!