Troubleshooting a IMAC video issue?

Discussion in 'Mac OS and Software Assistance' started by tomcat1, Mar 3, 2017.

  1. tomcat1

    tomcat1

    Joined:
    Sep 28, 2013
    Messages:
    2
    Location:
    Rural Moniteau County, Missouri
    I have clean, high end IMAC that I rescued from a trash dumpster. It has a cracked LED screen that doesn’t work. The machine does boot hooked to a secondary monitor. The hard drive is a Samsung Pro SSD 250 GB which has been wiped. I have attempted to load El Capitan from a USB stick and Mountain Lion by internet recovery. Both attempts resulted in the video signal ceasing and subsequently ending in sleep mode on the monitor after about 20 minutes of the install process.

    My question is… am I doing something wrong…is there a setting that needs to be changed or do I have a bad video chip on the logic board? Frankly, I suspect the latter!

    Please don’t tell me to take it back to the dumpster…..LOL!

    Here are the specifications on the IMAC:

    Late 2012 model 1418/EMC 2544 2.7 GHz i5 CPU with 8 GB DDR3. Serial number: #C02KW6PRDNCR
     
  2. tomcat1

    tomcat1

    Joined:
    Sep 28, 2013
    Messages:
    2
    Location:
    Rural Moniteau County, Missouri
    I stumbled on to the fix late this morning. The issue was the machine going to sleep during the OS install….so I rebooted the system and did the internet recovery mode again with a key on the keyboard taped down. This kept the machine busy and Mountain Lion installed without a hitch. I would assume you could work the mouse for a hour or so and have the same result. Regardless now I have a very nice iMac for the cost of the cracked replacement screen.