External hard drive used to be recognised in iTunes but has stopped...

I moved my itunes library onto an external HD a while ago. All was well.
Mac went into repairers. Now the HD is recognised but not in iTunes.
I've done the preferences thing to try to "move" the location but no good.
Any suggestions?

Connect the external to the computer. Launch iTunes while down the Option key. Navigate to library on external when prompted.

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    The Tragedy that will be, the tragedy that never should be
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