This morning my MacBook started behaving strangely. Everything froze while I was browsing the web, and the beach ball started spinning indefinitely.
I rebooted it, but only to be greeted by the grey screen with the blinking question mark-folder. I rebooted it again, and everything seemed fine. Then I launched Chrome, and it froze up again. Thinking it was an issue with Chrome, I did another reboot and did a fresh reinstall of Chrome.
New reboot. Gray screen with question mark folder (which I later found out is due to the system not finding a drive to boot from). I rebooted several times with the same result before I found out about the command+r that would take the computer into recovery mode during restart. In recovery mode, Disk Utilities shows this screen, and I was unable to do anything with the hard drive (the utility only shows the Superdrive DVD-drive and the image for the recovery system, not the "Macintosh HD" it should):
I did another restart and held cmd+r, and suddenly the drive was discovered by Disk Utilities in the recovery options. So I did a verify- and repair on it and was able to boot into the OS. There I first did a virus scan with Sophos (no threats reported) before I checked the disk in Disk Utilities again. S.M.A.R.T. reported the drive was OK, and I couldn't see anything indicating that the drive itself is mechanically failing. I took the opportunity to back up my important files to a cloud service.
Crossing my fingers that the issue was transient, and that I had rectified it by verifying and reparing disk permissions, I rebooted again. Grey screen with question mark folder again. New reboot, cmd+r held in. Back to recovery mode. No disk is selectable, neither as start up disk nor as a disk where I can do a clean OS install.
Any clues as to how I might get my MacBook up and running again?
I rebooted it, but only to be greeted by the grey screen with the blinking question mark-folder. I rebooted it again, and everything seemed fine. Then I launched Chrome, and it froze up again. Thinking it was an issue with Chrome, I did another reboot and did a fresh reinstall of Chrome.
New reboot. Gray screen with question mark folder (which I later found out is due to the system not finding a drive to boot from). I rebooted several times with the same result before I found out about the command+r that would take the computer into recovery mode during restart. In recovery mode, Disk Utilities shows this screen, and I was unable to do anything with the hard drive (the utility only shows the Superdrive DVD-drive and the image for the recovery system, not the "Macintosh HD" it should):

I did another restart and held cmd+r, and suddenly the drive was discovered by Disk Utilities in the recovery options. So I did a verify- and repair on it and was able to boot into the OS. There I first did a virus scan with Sophos (no threats reported) before I checked the disk in Disk Utilities again. S.M.A.R.T. reported the drive was OK, and I couldn't see anything indicating that the drive itself is mechanically failing. I took the opportunity to back up my important files to a cloud service.
Crossing my fingers that the issue was transient, and that I had rectified it by verifying and reparing disk permissions, I rebooted again. Grey screen with question mark folder again. New reboot, cmd+r held in. Back to recovery mode. No disk is selectable, neither as start up disk nor as a disk where I can do a clean OS install.
Any clues as to how I might get my MacBook up and running again?
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