I can neither send or receive faxes

yes there is a batt on the board it will need to replaced i have seen this many times

No dial tone detected, make sure you are plugged into the LINE port.

Turn the machine off for 10 seconds.

If the display shows 00% there is nothing in memory.

If a new toner cartridge doesn't take care of it, replace the fuser.

Error 055 is a laser error. the laser is not spinning at the proper speed and may need replacement. There is another solution, where some ferrite cores are added around three cables to reduce electronic interference. Best call a local technician for further diagnosis.

Check your phone line by plugging a regular phone in.

Unplug the power cord in the rear of the machine

Open the document feeder by pulling it straight up

hold down the pointed switch by the scanner glass while plugging the machine back in until you hear a beep

close the document feeder

scroll down to SHIPMENT SET

press SET or START

press 2

wait for the machine to reboot.

The receiving fax machine is turned off or not functioning. Try calling your cell phone.

Do you have a DSL phone line?

It sounds like you are stuck in the boot-up mode.

Try this:
Open the toner door and remove the cartridge
Turn the machine off
Open the document feeder by pulling straight up
While turning the machine back on, hold down the pointed switch actuator closest to the small glass
Close the document feeder..display should read "RAM INITIALIZE"
Scroll down to "SHIPMENT SET"
Press "SET"
Press "2" for "NO"
Wait for the machine to reboot (could take 5 mins)

Some times a bad toner cartridge will cause this.
If this does not work, you have a bad Main PC Board. Uneconomical to repair.

No. If this is needed, make sure to turn on automatic reports