Computer won't go into "Start-Up Manager" mode

This regards my iMac, 21" model 1.25gHz PPC G4, 2 GbRAM, 160GB HD. OSX 10.4.11
I have several Macs, and have been using CCC for years to make bootable clones on fire wire external hard drives. For some weird reason, now this machine will not go into "Start Up Manager" mode upon starting. Under normal use, this machine "sees" my external FW drive, and if I go to "Start-Up Disk" in the prefs, and select my clone, this machine will start up fine using the clone. But this machine will not go into "Start-up Manager" mode when I hold down the Option key upon fresh start up.

I tried to boot in "Open Firmware Mode" as suggested by the Apple Help Topic (command-option-o-f) and still no go. I did replace the hard drive with a larger one after I bought it, so I'm guessing that perhaps I have the jumpers installed incorrectly, that is interfering with any start-up options being made available to me.
The computer works fine, I did test my clone by selecting it in the System Prefs>>Startup Disk (it just won't boot). So if I have a boot drive failure, all I need to do is open the unit up and replace the physical drive with the clone to get back in operation. It's a real pain getting to the drive in this unit and I don't want to have to do it again unless absolutely necessary.

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Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom to say “Thanks” for helping!

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Computer won't go into "Start-Up Manager" mode

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