hope the above helps someone else with a similar issue.I have an iMac (21.5-inch, Mid 2010) with 12 GB RAM and a 500 GB hard drive running High Sierra 10.13.6. and if it can, can it be made permanent? I don't need a dedicated GPU for what I'm doing. Next thing I would like to figure is if I can disable the Nvidia GPU and try the Intel HD graphics to see if its the GPU or the LCD - can this be done. None of the Kernel crashes I expected to see occured and it recognized all the components CPU, GPU, non retina display etc.

This SSD was then put into the 2010 machine and hey presto after 30 sec it output to the external monitor. To get working, I created a high Sierra USB install disk and then created a fresh copy of Sierra on an external SSD that was attached to my Macbook Pro Late 2013 machine. I think I assumed that as on a windows MOBO the signal would be output to the external monitor as soon as the laptop was turned on - like the windows BIOS info etc. Seems the boot process needs to be quite far along before it will accept the Command F1 to send it to the external monitor - as mentioned, I didn't have a working boot disk so I guess it never reached that stage - plus the fact that I couldn't see the laptop screen to see what was happening. So for those with a similar issue here are some observations (& assumptions) now that I have it sending the signal to an external monitor:ġ. I have a Macbook Pro retina Late 2013 - if I install Macos (Sierra) to an external hard drive of that machine and transfer the drive into the 2010 - would that work or will I just get lots of Kernel Panics?

Not sure what to do next to get the signal out the machine when first turning on. disconnected the video ribon cable inside the machine hoping it would recognize no display and automatically send it to the external port. Plugged in external monitor and USB keyboard, powered on and closed the lid then tapped the USB keyboard. I would like to do the same (or even fix the LCD at some point) unfortunately, I cant find a way to send the video signal to my external monitor at boot so I can install macOS from a boot drive onto the new SSD I have.ġ. The system has had its hard drive removed by previous owner who was using it with an external monitor. Unfortunately the display as graphical issues and is just alternating black and white vertical bands at all times. Trying to fix a Macbook Pro 15' mid 2010.

Boot imac operating system