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Jul 28, 2015 2:49 PM in response to Linc Davisby beauchampy,Thanks, but I didn't have this problem on my 2013 mbpr on the same desk with exactly the same peripherals and drives connected.. Leads me to believe it's something to do with the machine, maybe internal interference.
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Jul 28, 2015 2:59 PM in response to beauchampyby Linc Davis,Make a "Genius" appointment at an Apple Store, or go to another authorized service provider. You may have to leave the machine there for several days.
Back up all data on the internal drive(s) before you hand over your computer to anyone. There are ways to back up a computer that isn't fully functional—ask if you need guidance.
If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
Apple also recommends that you deauthorize a device in the iTunes Store before having it serviced.
*An SSD doesn't need to be zeroed.