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This is one of two issues. Either your power cord has failed and needs to be replaced, you can order a power cord here. http://amzn.to/20hBOHw
Or, the powersupply in the machine has failed.. Finding parts for that machine is extremely difficult at best. They werent even selling the power cords on ebay, if that tells you anything~ Its probably time to consider a new printer, an economical choice that offers wireless printing is this printer. http://amzn.to/1K04kt9
About the only repair steps you can try at this point besides replacing the cord would be to physically remove the entire power cord from the machine.
Then, plug it back in to a known working outlet.. And by known working I mean plug something else into it such as a lamp and see if it turns on. Also, remove all ink tanks from the brother machine with the power off. Then plug it back in and see if it powers up or shows any signs of life at all . if it doesnt. Then your power supply is blown and you should either replace the cord or replace the machine.. And I lean towards replace the machine itself as there is no guarantee that replacing the cord will fix it.
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