Yun's configure wifi webpage not loading

When I first loaded the Yun and went to arduino.local, the webpage loaded and I configured the Yun to my network, but entered the wrong password. The Yun then did not connect to the server, and it's own ArduinoYun-XXXXXXXXXXXX network disappeared. In an attempt to recover this network, I held down the WiFi reset button for at least 30 seconds and reset the Linino distrubution to its default state as it says at http://arduino.cc/en/Guide/ArduinoYun#toc6. When I try to go back to the webpage, my browser says that it is not available and when I try to ping the Yun's IP address, the requests time out.

I think that resetting the distribution may have deleted the webpage, but that might not be the case.
Is there any way to recover the webpage/configure it to connect to my network with the correct password?

It will take a couple of minutes for linino to reset, much longer than the Leonardo part of the yun . A good way to know what is going on is to load the YunSerialterminal example sketch (its under Bridge on the examples menu) through the usb . Open the serial monitor and press the reset button by the LEDs.

I did as you said and Linux is working fine. This was the only error:

[   39.810000] Error: Driver 'gpio-keys-polled' is already registered, aborting...

I also tried a fresh Yun and went to http://192.168.240.1, and when I pressed configure, it hanged, and when I exited the window, I could not come back to the website again.
I am new to the Yun and suspect that there might be a networking problem and don't know what to do next.

The gpio-keys-polled message is normal, I see it on every reboot. I have seen posts on the forum about wifi connection problems being caused by wifi routers set to use a 40MHz band, set yours to only allow 20MHz if you can just to be safe.
Once the Linino completes the boot up you can execute:ifconfig from the serial monitor and see what ip the yun is at, it should be on the second line of the wlan section of the output as inet addr.

wlan0     Link encap:Ethernet  HWaddr C4:93:00:00:7D:27  
          inet addr:192.168.2.200 Bcast:192.168.2.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:72314 errors:0 dropped:12835 overruns:0 frame:0
          TX packets:4214 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:32 
          RX bytes:9793634 (9.3 MiB)  TX bytes:724007 (707.0 KiB)

Then you can execute passwd which lets you set the password, if you get Bad password: too weak you can ignore it, it is just a warning. Once you know the passwd you should be able to put the ip in your browser and see what is going on.

Setting the password is working, but when I go to my browser, the ip address does not load and the browser says that the page is unavailable. Is there any way to configure all of the settings that can be configured on the webpage through the serial monitor just like I was able to do for the password?

Actually, I think I somehow solved the problem.
When I uploaded the TemperatureWebPanel sketch over wifi through the arduino's own network, I was able to configure the settings through http://arduino.local again and put it on my network.
Now I have another problem.
When the TemperatureWebPanel sketch loads through a wifi connection, it says:

Warning: Problem accessing board folder /www/sd

and does not place the files on the SD card.
I have looked at the forum and I have done what other people have suggested and what the sketch itself says to do, and the SD card once worked with an Ethernet Shield.
Do you know of any way to upload the files?

I'm not sure what was going on with your network issues but since it is working now, if it ain't broke don't fix it.

You can configure ANYTHING on the Linino side of things through a serial monitor connection, it just isn't very easy sometimes. UCI is the command line interface that Luci (advanced configuration panel) uses from the webpage setups. At an even lower level you can edit the configuration files directly. All that isn't really necessary to know unless you just want to learn the nuts and bolts of the system. It is very easy to get it very screwed up as well. You may want to get a better monitor set up, either PuTTY in Windows or picocom in Linux.

For the temperature web panel to work, in the serial monitor connection

ls /mnt/sd
Arduino-1.5.4      SIZE_TST.TXT       arduino
Arduino-1.5.4.zip  TEST_SD.TXT

should show that you have a arduino directory present like above, other things can be there too. If that is there then you should also have a www directory inside of that

 ls /mnt/sd/arduino/
www

If those aren't there then

 mkdir /mnt/sd/arduino
mkdir /mnt/sd/arduino/www

will create them.

Thanks for the reply and all of your help so far, but I was able to upload the files by using an external power supply.
Now, the website only shows a 0, but the program seems to be writing a bunch of data to the website other than a 0.
I looked at the console on Chrome and it said that the Yun was not replying with any data.
When I connected the Yun back to the Serial connection, it did not print out any commands from the website, so there is some communication issue.
Is there anything that I can configure on the Linino side/anywhere to make the example run correctly?

I have seen quite a few post about this example but I don't have any trouble.

Take a look at what has fixed problems for others, if none of those fix your problem it would be best to start a new thread with details of your situation.

Thanks. I think everything is working fine now after turning off the password for Rest.