3 finger restart power, + and - all at the same time until it restarts.
Yes, try holding the volume up (+) and volume down (-) buttons down at the same time as you hold the power button down until it restarts, may take a few seconds, but keep holding all three of them down at the same time until the Playbook restarts, let it reboot and try again. You can try rebooting your modem and router while the PB reboots just to be sure. Good luck.
Can you delete the wifi and then add it manually? If so do this. Continue to try and swipe back and forth also. This happened to me long time ago and I swiped back and forth until I was able to delete the wifi, I then added manually and all was well.
Just because your WiFi password is 12345678 I'm guessing you also did not place a great deal of effort in searching for an answer first. Why don't you reset and restore again