My 16 channel Yamaha mixer board will not power on as if power switch is messed up I'm wondering if there is an easy fix
It depends. If if has an external power supply, you can try a different supply of the same rating. Beyond that, it may be a blown fuse, which may be internal on the power supply board, or as you say perhaps a broken power switch. Whether it's easy or not will depend on your diagnostic skills, how much you know about electronic repairs, and your availability of parts.
Generally, i suggest people take their repairs to professionals as poking around inside electronic gear can cause more damage, both to the gear and to themselves.
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