If a printer is not printing anything, there could be many reasons behind it. Might possible ink usually called cartridge or toner has finished or printing head is dead.
Sometimes we have seen among all these reasons also it occurs due to driver and connection between printer and computer.
Before buying any new ink tank or cartridge check your driver is working fine or not. Open Brother software installed in your computer. There would be an option check cartridge or clean your cartridge.
Run this option it will clean your cartridge point and forcefully print some code and text. This command is very useful and restarts printing if the head pointer is blocked.