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My UM3EXT not booting

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Posted · My UM3EXT not booting

My UM3EXT has been working great for months and now, all of a sudden, it won't power on.  when  


1) flip the switch to ON

2) a fan starts to spin for about 2-3 seconds

3) then that fan stops

4) nothing else happens 

 What is the problem

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