Unable to connect to internet - On-Board Ethernet Grayed Out

Hi,
This is my first post....
I have had my iMac for 2+ years and have had no issues. I recently updated to the beta version of Safari and had issues with hotmail not working. So I uninstalled and went back to the "old" Safari. When I did this iTunes stopped working. So I went into the Apple Store and it appears that when I uninstalled the Safari beta it did not uninstall the webkit properly. So at the Genius Bar they did a backup, re-installed the OS, and updates. They did it all within the store, using the store server, and wireless. When I got home and plugged in my iMac and connected it to my cable internet connection, I got no internet. My cable router does not show any signal, power on light on and cable light on, no data light. I was having no issue before I brought the iMac into the store. When I plug my work laptop (Windows, of course), the router lights up. Whenever I restart, or logoff, the iMac it goes straight to wireless trying to find a connection. I went into preferences and checked out the Network Ports, my FireWire, Bluetooth, and Airport are checked blue, but my on-board Ethernet is gray and cannot be checked.
Did my ethernet card go bad coincidently with me taking my iMac to the Apple Store, or did something get turned off when the updates were done at the Apple Store? Is there a "switch" I need to flip somewhere?
Thanks
Chris

*"If I am getting no signal from the router, should the built-in ethernet option by grayed out, or should it be selectable? "*
No signal from the router could definitely by the culprit. Try turning everything off, router (disconnect from power source), and the iMac. Leave everything off for about 5 minutes. Reboot the iMac, wait until it it boots to the Desktop. Turn the router back on and see if that makes a difference.
You can try downloading and installing the 10.4.11 combo update available here
http://www.apple.com/downloads/macosx/apple/macosx_updates/macosx10411comboupdat eppc.html I know you are already running 10.4.11, but this update is recommended for all users running Mac OS X Tiger and includes *general operating system fixes* that enhance the stability, compatibility and security of your Mac. This update also includes Safari 3, the latest version of Apple's web browser.
If you do this, make sure and repair disk permissions after the install. Launch Disk Utility. (Applications/Utilities) Select MacintoshHD in the panel on the left, select FirstAid, then click: Repair Disk Permissions. Quit DU when it's finished and reboot.
Carolyn

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