Only one device connecting to the internet?

Lost power from Hurricane Sandy, internet would not come back online, replaced the cable modem, now one laptop connects to the internet but not the other computers or iPhones or iPad. Comcast is USELESS (most polite description I have for them).
My Airport Extreme shows Excellent quality on all devices connected to it, but the Internet (brand new cable modem Motorola SB5120) shows yellow, connection: Disconnected, but does have a router address for all but one computer which is able to connect to the internet via this network. I have restarted, rebooted, and reconfigured my network. Why is one device able to connect but no others? What are my troubleshooting options?
Thank you!

Only one device (the laptop) can connect to the Internet?
Or
Only one device at a time can connect to the Internet?
Power off the laptop that can connect
Power off the cable modem and AirPort Extreme as well
Wait 5-10 minutes
Power up the modem first and let it run a few minutes by itself
Power up the AirPort Extreme next the same way
Power up the iPad and see if it can connect to the Internet
Post back on your results

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Hi MnM Show,
Tim is correct, if you are using ISCSI Storage and using the network to get to it, it is recommended that the iSCSI Storage fabric have a dedicated and isolated network. This
network should be disabled for Cluster communications so that the network is dedicated to only storage related traffic.
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The related article:
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http://blogs.technet.com/b/askcore/archive/2014/02/20/configuring-windows-failover-cluster-networks.aspx
I’m glad to be of help to you!
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected]

I have two iPads and one is connected to the internet but my other iPad was connected then was not and since then I have not been able to add my internet back onto my iPad it only says cannot connect to the server any help would be great thanks

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Whenever I access the wireless network at home with a laptop or iPod, it kicks my wife off of the iMac's access. Basically, only one device can use the wireless network at a time.
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Only one device connecting to the internet?

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