Greetings, please make sure the front panel door is open when pressing the Go button for 4 seconds. This should reset the drum counter. If the light continues to blink after a proper reset, there could be an issue with the replacement drum and you should contact the seller, especially if it is remanufactured.
If you need additional information, please let me know.
I have a Brothers printer HL 2240 that will not print.