Airport not accepting users at the same time???

I searched the archives so my apologies if this topic has already been answered. Please help. About a week ago we discontinued dsl and got cable internet. All seemed to be working fine for a few days with the airport extreme and two expresses in the house. (modem supplied by adelphia and plugged into WAN port of extreme). Then we noticed that we lost service every time we went into the vicinity of one of the expresses, and realized that the light was always yellow. We couldn't get it to connect, so we just got rid of it. That's when our problems started.
Now, whenever we do diagnostics (using safari) we can easily connect with one computer by restarting the modem and airport. Problem is then the other computer gets disconnected. We can connect by directly plugging the computer into the ethernet cable from the modem, so we know it's not the cable modem. I don't understand when only one computer can connect at a time using airport, but that seems to be the case right now.
Are there any suggestions to what we might try? Thanks so much!!!
-Cindy

Excuse my lazyness but I cut and pasted a previous
post that I haelped with here and here is the link,
try a complete system reset.
Just a thought, and a little more info.
In Kansas, the land of the 3 suns, we have some
storms that are worth writing home about. I lost an
extreme because of exactly what you explained just
the WAN port everything else was fine.
Fortunatly in my case Applecare took care of it.
Just one final idea. sometimes when doing a complete
system reset it requires you to wait longer than the
5 minutes and if for some reason your not waiting
long enough for your Modem and your Extreme to
acquire the signal it will also cause you problems
with the wireless portion of your Airport Extreme.
First make sure your settings in System Preferences
and Network are set to Airport and it is highlighted
with the green dot and drag it to the top of the
list.
Next sut your computers clear off.
Next make sure you pull the power adapter from the
ISP's Modem and the Airport Extreme and wait 10
minutes this time, now inthis order after your wait.
Plug in the ISP's Modem and wait at least a minute or
until all of your lights are functioning.(Normally 3)
depending on the Modem you have.
After this plug in the power adapter to the Extreme.
NOTE: just sutting them off with the power button
doesn't work you have to pull the power adapter from
the back of both.
Now that you have waited the 2nd time for the Extreme
to acquire the signal you should be good to go.
another NOTE: I have had to repeat this process as
many as 3 time before I have gotten it to work each
time waiting longer in between steps. If this doesn't
do the trick then you might have very well have
cooked something atributed to the power outage caused
by either a Power Surge or Lightning
Ignore the storm and lightning unless it applies.
Cheers Don
You know, I really hate being an idiot--but I guess you always learn from your mistakes!!
So, this is what happened--I followed all the directions (or so I thought) for resetting the airport, checking the indicator lights, unplugging for half and hour--all that. EXCEPT, that when I was resetting the airport, the airport was OFF!! The dsl modem which I used to have required you to hit the reset button when it was off--I don't know why. So I naturally assumed that I had to unplug the airport and hold the reset button. But alas, butthead over here needed to reset the airport while it was on. So, that was the solution. You guys are all so helpful and kind to us morons....er, I'm not the only one, right???

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