[Elecraft] K2 won't come on.

[kf4clo]

HI EVERYONE
  My K2 has been working great for over a year. turned it on this evening
and the light flashed and the internal fuse blew. I removed all the
options(100watt,noise blanker and ssb board). hooked a meter to the ground
and 12v input and have 12v with the k2 on or off. U4 and u5 (regulated power
supplies on the control board) Nothing. I might have to send it to Elecraft
but any ideas would be great.

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