imac 27" late 2011 external display problem

Discussion in 'iMac' started by bennyboy22, Feb 25, 2015.

  1. bennyboy22 macrumors newbie

    Feb 25, 2015
    Hi guys I have a 27" iMac which I have acquired from a friend, it currently has no hard drive in it, it boots up and chimes, fans spin , have connected it through thunderbolt to hdmi but nothing comes up on my tv...? The 3 led diagnostic lights are on so therefore video card seems to be communicating with the logic board , 4th light is not going as I currently have disconnected the LCD (faulty). My question is do you need a hard drive with os on it in order to use the thunderbolt ports?
  2. bmcgrath macrumors 65816


    Oct 5, 2006
    London, United Kingdom
    I would imagine an OS is required which will have the relevant drivers in place to enable the ports...

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