Connection issues-- remote, other computer, printer

HI
Everything USED to work just fine. Then it became sluggish a few weeks ago. I unplugged everything overnight and in the morning nothing worked. I have an ibook (G4) connected to the internet with an airport extreme.. that is running through a Linksys router (other computers use a cable here). For the moment I've taken the router out of the loop. I now have the Airport Extreme up and connecting me to the internet, but I can't get the Airport Express we use to extend the network to connect (yes, I have followed all the instructions in 'help'). I also can't get the printer to work (although the computer recognizes that it there) and the other wireless laptop in the house can't connect. What's up??
Any help??
marie

No Apple problems
http://www.apple.com/support/systemstatus/
Does the iOS device connect to other networks?
Does the iOS device see the network?
Any error messages?
Do other devices now connect?
Did the iOS device connect before?
Try the following to rule out a software problem:                 
- Reset the iOS device. Nothing will be lost
Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Power off and then back on your router
.- Reset network settings: Settings>General>Reset>Reset Network Settings
- iOS: Troubleshooting Wi-Fi networks and connections
- Wi-Fi: Unable to connect to an 802.11n Wi-Fi network       
- iOS: Recommended settings for Wi-Fi routers and access points
- Restore from backup. See:
iOS: How to back up
- Restore to factory settings/new iOS device.
If still problem make an appointment at the Genius Bar of an Apple store since it appears you have a hardware problem.
Apple Retail Store - Genius Bar

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