Indoor Bluram's Dome Lite 2 A31 camera's

Hi,  I have three Bluram’s Dome Lite 2 A31 camera’s and all of a sudden they all stopped working yesterday.   Nothing has changed with my modem or wireless router that I have and all of a sudden they stopped working on Friday.  I have tried to re-add the Wi-fi and I have followed the steps and when it goes to connected I get the message that it failed to connect and to check the password and move closer to the router.  

Today I unplugged the modem and the wireless router for about 10-15 minutes or so and then tried to re-add them and I am still getting the same error message "it failed to connect and to check the password and move closer to the router".  I have done both of these items and they still don't work.  

I am connected to the internet and I have wireless and everything else in my house is working.

Please let me know as I am extremely frustrated and upset that I may have to purchase new camera's for my house.  

Thank you,

Barbara Kellar