Booting With External Drive Connected

Discussion in 'Mac Basics and Help' started by Rian Gray, Aug 20, 2014.

  1. Rian Gray macrumors regular

    Rian Gray

    Jul 13, 2011
    NJ, United States
    I have 4 drives connected to my iMac, one of which is Time Machine backup drive.

    Every time I try to boot with the external drives connected to the machine, it stays in gray booting screen. It doesn't stop or halt, I simply need to disconnect or turn off my drive docks. I certainly checked startup disk setting, it was set to Mac.

    Has anyone encountered this kind of problem before? I never had such problem before, so I'm not sure if this is ordinary behavior.
  2. campyguy macrumors 68040

    Mar 21, 2014
    Portland / Seattle
    I have - with USB3-capable drives, but not with TB drives or a old G-Tech eSATA RAID drive connected via a (really cheap) USB-eSATA adapter. I have also experienced what you're describing when I have an HDTV connected via HDMI, maybe 1 out of 20 times.

    None of the cables I'm using are "cheap", and it's random. And annoying...

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