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Please tell me what 'red light' is On, on your Brother HL-series laser printer ?
(You can use the Reply To Expert function, to let me know, please.)
Try turning the printer Off for 10 minutes (or longer).
Also, try taking out the toner cartridge/drum assembly, then seating them back into their place, and closing up the printer completely.
Examine the path the paper takes through the printer, with a flashlight if needed at all. Make sure there is not even a small scrap of paper in the printer - such small scraps, often overlooked, can disable a printer persistently, until they are removed.
Let me know what happens, what you find, what results, please. Thanks.
OK. I await your response as to any results.