If when booting up your Mac you see a box with a flashing question mark inside then this means it is unable to find the start up disk and therefore unable to boot up. In this tutorial i will advise how to fix it without a hardware repair, if none of the following steps work then a hardware repair needs doing. You can give us a call and we can recommend a repair company that can help, unfortunately we cannot do a hardware fixes ourselves yet this may be something that we’ll incorporate in the future.
Step one- Turn off your computer, turn it on and press and hold Command and R until you see the Apple logo or spinning globe.
Step Two- This should boot the computer into recovery mode where you’ll see about 4 options, please select “Disk Utility”, once in there please select the disk C and click First aid which will repair the hard drive.
Step Three- If the disk repair doesn’t work then you need to back up your data if possible, if it does work then click restart and the computer should boot up fine. Once data is backed up onto an external hard drive or memory stick then please follow step 1 again to go into recovery mode.
Step Four- Once in recovery mode click on disk utility again and click on the disk and erase once the disk is erased, select Reinstall macOS from the Utilities window and make sure you select the external disk you just erased.
Step Five- This should re-install the OS back onto your hard drive and fix the issue, this may take 30 mins to 1 hour. If you are still having issues with the Mac not booting then please give us a call and someone can either come out and help get this working or someone can advise over the phone if you have any questions. You will find out contact details in the enquiries tab at the top of the page. Thank you for reading and i hope this helps fix’s your mac.