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You may have blown a fuse in the amplifier. Refer to Appendix A: Service Info in this guide
http://www.mackie.com/products/mr5/pdf/mr5_om.pdf under No Power section, and if the fuse it not blown, try some of the solutions under No Sound. Hope this helps!
IF that speaker runs noticeably hotter than the other channel speaker, you need to take it to an authorized repair center. Your monitors are apparently active types, so unless you are a trained audio technician, you should refer service to the pros. Apparently, the problem is in one of the power amplifiers in the affected monitor.
I would contact Mackie and see what they say. The MR5 is already protected internally by the built in amplifier circuitry as far as I know.They can be reached here:http://www.mackie.com/support/index.html