Older MacBook connects to guest netowrk, but not main

I recently set up a home network with the newest model Airport Extreme. I've set it up with a home network, as well as a guest network. It has been working flawlessly, with one exception. My older MacBook (3yrs old, white) had been connecting to my my home network, but starting a couple days ago, it began refusing to connect. I can still connect fine to my guest network, but the whole point of me buying this whole set up was to use the older MacBook as a media server for the rest of my home. Any advice would be greatly appreciated.
Thanks!

LOST_Island, welcome to the discussion area?
Have you checked the Connection List for the MacBook to make sure that the name of your main network appears first in the list of wireless connections?
System Preferences (gear icon on dock)
Open Network
Click AirPort on the left to highlight it
Click Advanced at the lower right
Make sure that the name of your main network is at the top of the connection list. Drag it to the top if needed.
Click OK, then click Apply
If no help, can you tell us what happens if you temporarily turn off the Guest network on the AirPort Extreme? Will the MacBook consistently connect to your main network this way?
AirPort Utility - Manual Setup
Click the Guest Network tab
Remove the check mark next to Enable Guest Network
Click Update at the lower right and let the AirPort Extreme restart
You really should not use the Guest network unless you have "guests" because it does pull some bandwidth away from the main network.

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rvenable wrote:
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Fishbair wrote:
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Older MacBook connects to guest netowrk, but not main

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