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13 inch MacBookPro.
Trying to repair from 'grey screen' at start up.
Drive is visible in Disk Repair ... ran and all ok.
Restarts and emergency starts all failing because cant find start up disk.
Restarting from Apple 'On-Line Start up... connected ... ready to go ... but cant find start up disk to chose from.
OPTION #1:
You need a genuine Installer Flash Drive that contains a compatible
OS for your Macbook.
Follow the procedure below to prepare the Installer....
https://support.apple.com/kb/HT201372
How to create a bootable installer for macOS
Insert the Drive and power on while holding the OPTION Key.
You should see the the OS Installer volume icon.
Click on it and follow the installation instructions.
OPTION #2:
https://support.apple.com/en-us/HT204904
How to reinstall macOS from macOS Recovery
Connect a reliable Internet feed to your Laptop,
Or... Make available, a strong Wireless Internet feed.
Power ON while holding the COMMAND + R Keys.
A Globe Icon will appear. Then a Wireless Connect option.
SELECT your Wireless Internet access and enter the PASSWORD.
Your Laptop will then take about to 15 minutes to download
the Recovery Utility.
SELECT install OSX.
Follow install instructions.
OPTION #1:
You need a genuine Installer Flash Drive that contains a compatible
OS for your Macbook.
Follow the procedure below to prepare the Installer....
https://support.apple.com/kb/HT201372
How to create a bootable installer for macOS
Insert the Drive and power on while holding the OPTION Key.
You should see the the OS Installer volume icon.
Click on it and follow the installation instructions.
OPTION #2:
https://support.apple.com/en-us/HT204904
How to reinstall macOS from macOS Recovery
Connect a reliable Internet feed to your Laptop,
Or... Make available, a strong Wireless Internet feed.
Power ON while holding the COMMAND + R Keys.
A Globe Icon will appear. Then a Wireless Connect option.
SELECT your Wireless Internet access and enter the PASSWORD.
Your Laptop will then take about to 15 minutes to download
the Recovery Utility.
SELECT install OSX.
Follow install instructions.
Hi, thanks for replying.
Attempted this along with all the other recommended fixes, always comes back to no start up disk image to chose where to re-install or recover on the internet.
1st aid runs OK.
HI,
Thanks for replying.
I'm just attempting to start the computer. I'm getting the circle with a line through it, then the question mark etc. Following all instructions to repair and re-install but theres never a start up disk to install to
Basically, it looks like the machine can find the start up disk image ... or cant connect to the start up disk. Seems no way out of this, going around in circles.
May need to go to a shop.
1st aid runs OK.
"1st aid runs OK."
Hi, If you were able to run Disk First Aid, and the HD tested OK,
then it means that you erased that HD and there os no OS on it....
Which is why it can not boot and shows a GRAY Screen with a
Prohibition Icon... circle with diagonal line.
Hi Phillip, Were you attempting a system erase and install process prior ??
cant find the start up disk
