Fax machine not working

the fax on my all-in-one hp printer does not work

buy a new fax then..they don't last forever.
I read some reviews and this one is good for under an hundred bucks..used to be 300
You can get a good one here

Clear NV RAM..... Unplug the Power Supply from the Printer.... Press and Hold the #5 button on the Printer and plug in the Power Supply....... Don Release the #5 button till the Printer turns on completely.... After releasing the #5 button........ Press the Menu button once Keep on Pressing the Right Navigation Key till u find an option  saying Maintanence goto maintanenece and go to manufacturing and click on clear NV RAM..... Now as soon as the Printer is Restarted....... U will be able to send and recieve faxes..... Thanku.............