DVD Drive not recognized in BIOS on dv9720us and dv9723cl

I have 2 dv9700 series laptops. Neither of them will recognize the DVD drive in BIOS or in Windows. They both failed over time. It was not an immediate thing. I have replaced both the drives, and both of the sata "extender" that goes between the motherboard and dvd drive. Still neither of them see any DVD drives. The sata hard drives (and even the secondary hard drives) all function perfectly. Both machines have been upgraded to the newest BIOS (vF.34) and both machines are running Windows Vista 32 (Ubuntu Linux 12.04 was booted from a flash drive and it too does not see the DVD drives). An external DVD drive connected via USB works fine, but this is not an acceptable solution as that kinda' takes away from the whole "portability" of the notebook.
Does anyone have any ideas?
Oh, one other thing, all (4 now) drives open and close perfectly and even do a seek upon bootup, but still no recogniztion from BIOS.

An update for anyone interested ... 
This is just for the dv9720us, I haven't had a chance to work on the dv9723cl yet.
The solder points on the motherboard where the SATA extender card connects for the DVD drive looked like they were "cold" and not really flush on the motheroard. So, after some fine tip soldering to fix those "cold" joints, the DVD drive works perfectly!
Just one more imperfection in this line of laptops.

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