Built-In Ethernet port configuration "grayed-out" in "Port Configurations"

Suddenly my "Built-In Ethernet" port configuration isn't clickable in Network Preferences' "Port Configurations" window. It's there but is "grayed-out" and the "On" clickbox won't take a checkmark.
Also, it's not showing up at all in the "Show" pull-down (since it's not clicked probably?).
My hub and modem are fine (i can connect to the internet with my wireless airport-laptop)except the "local network" indicator lamp on the hub where the ethernet cable is plugged doesn't light as it used to.
I recently had to delete some files so maybe that's why?
(Can't retrieve them, sorry! Maybe some names...)
Thanks much for any help!
here's the inf on my Desktop Mac which is running OS 10.4.9:
Machine Name: Power Mac G4
Machine Model: PowerMac3,6
CPU Type: PowerPC G4 (3.3)
Number Of CPUs: 2
CPU Speed: 1.42 GHz
L2 Cache (per CPU): 256 KB
L3 Cache (per CPU): 2 MB
Memory: 1 GB
Bus Speed: 167 MHz
Boot ROM Version: 4.6.0f1
PowerBook5,6 PowerPC G4 Mac OS X (10.4.9) PowerBook5,6 CPU Type PowerPC G4 (1.2)Number Of CPUs 1CPU Speed 1.67 GHz L2 Cache (per CPU) 512 KB M

well, what wonders an exercise break can bring!
I fixed the problem by looking on a backup disk for any files with the word "ethernet". I had done that on the local disk and didn't find anything of interest. But I did find these 4 files on the backup in a folder sitting directly on that external HD directory titled "System"inside of /library/extensions:
Apple_DEC21x4Ethernet.kext
AppleBCM5701Ethernet.kext
AppleBMacEthernet.kext
AppleGMACEthernet.kext
I copied them into my local HD's system/library/extensions EURIKA! the built-in ethernet has returned and I was immediately on line without any further adjustments.
The options that were missing as per my subject thread are all back.
Keep this one handy!!!
Thanks again for your help...I'm sure we'd have gotten there soon enough.
best,
Rob
PowerBook5,6 PowerPC G4 Mac OS X (10.3.9) PowerBook5,6 CPU Type PowerPC G4 (1.2)Number Of CPUs 1CPU Speed 1.67 GHz L2 Cach

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