Drive not recognized - new issue...help please

I am replacing a 120 GB drive with a 250 GB one to give more space for video files. On reboot, I get the message: You have inserted a drive not recognized...etc...with the choices to initialize, ignore or eject.
Then I notice that the drive on the same bus (in the bottom of the tray) is not seen on the desktop. It was in two volume partitions and was also a 250GB. Big mystery. So I remove the new one and connect just the older drive. No luck, message says ...a drive not recognized...etc. So then I change the jumpers twice - same results - and I remove the jumper...same thing. I see this drive in Disk Utility represented by a number and size (232 GB) but not by the volume names. And when I try to verify or repair, the option is greyed out (yes, I booted to the install disc and went to Disk Utility, as per instructions.
This disk has data on it I need, and it's not backed up. All I did was unplug the connectors and then replaced them as before. So please, tell me how I can restore this one. I could remove it and put it in an external FW enclosure and then see if it shows up, but I don't want to take chances. Worse case scenario is a data retrieval service - and I'm almost certain I shouldn't have to do that as this is a healthy drive.
Any suggestions very gratefully appreciated, thanks!
Keith

Tom, I tried every one of your suggestions: set the older drive (Seagate) at P4 and first connector on IDE ribbon to cable select and the new drive (Hitachi) in tray just above it at P5 - end connector on ribbon also to cable select. Result: two dialog boxes for both drive on reboot "You have inserted a device not recognized..."
Then I tried slave on the Seagate and Master on the Hitachi...same result as above.
Then I tried alternate Master and Cable Select configs. on the Hitachi for 15 or 16 pin..whatever that is...but was printed on strip on drive. No go.
I think it must be another issue here than jumpers...although that may have something to do with it. When I installed a new drive in my Quicksilver I never got the Device Not Recognized dialog...it either saw the drive with all data on it or it didn't, until I set the jumpers correctly, as directed for that incident.
What bothers me is that when I removed the new Hitachi entirely and reconnected the old Seagate as the only drive on that cable, either with jumper set to CS or M or S I am still getting the dialog.
Any other solutions, please.
K.

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