HP laptop dv6140 (RG274UA#ABA), system board ID 30B7 with BIOS version F.3D.. Installed Windows 7 upgrade. I feel certain I did this with DVD which meant that the DVD was working. However, I no longer see the DVD in either the BIOS or in Windows 7 except that I can alter the boot sequence to CD/DVD but that didn't help. Can anyone explain this and suggest what may have happened to my DVD drive and function? I know it is working since I can hear it spinning up when I put a CD or DVD in it. Also, I think there is a recovery partition on the hard drive but have been able to find a way to get to it. I would be fine with XP right now if I could get to the recovery partition. I think this system is originally XP Media.
If you have not opened the system and verified that all DVD/CD cables are secured to the motherboard you might want to.
I've also had some success with resetting the BIOS to the factory defaults. Just enter the BIOS (You may need to select a category such as Maintenance) and then select Load Defaults.