Cisco router password change and now select VOIP phones not working

I manage this school network and I went in today to reset the password on their Cisco 2800 series router. I didn't have the original password on the system because it wasn't shared with me and the only person that knew it had left, so I had to do the password recovery steps from here.

The password recovery went fine and I was able to change the passwords on the router to something new. I did change the password for the "web admin" under "telephony-service" section also in my password resetting routines.

So after I did all this all was seeming to work fine, until I was about to leave and found out that some office phones weren't working, and some were. The model phones that weren't working were the Cisco 7960 IP Phones, but the models that were working were the Cisco 7906 IP Phones. The 7960 phones were taking a long time to sync up with the VOIP server, which is the router. After a while the phone would say "Configuring VLAN", then it would goto "Configuring IP", then after a short time on that it would say "no load specified" and repeat the same process over and over. I've done some research and the "no load specified" refers to the phone not being able to load a configuration from the TFTP server, if I understand correctly.

So..

–Can my password reset operations cause something to happen with the TFTP server authentication?
–How can I check to see if the TFTP server is working fine?
–Why do some phones work fine?

This is the running-config. I didn't change any other settings in the running-config, only reset the passwords, and the phones were working just fine before the password reset.

Also, I'm not a Cisco professional, I know enough to go into the console, and run commands. So please be thorough with your instructions of things to try and what they mean. I want to have an understanding of commands before applying them.

Any help is appreciated.