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After upgrading from High Sierra 10.13.x (can't remember) to High Sierra 10.13.6, something went wrong with the boot partition. When turned on the MacBook shows the forbidden sign. However when I press and hold the Command key, it boots normally. So far so good, however in macOS safari and chrome are only showing blank pages, so I guess I re-install of macOS is a good idea. In order to do that you need to press CommandR during boot, but when I press anything more than Command only, the forbidden sign shows again.

fdisk shows:

Disk: /dev/disk0    geometry: 19457/255/63 [312581808 sectors]
Signature: 0xAA55
     Starting       Ending
 #: id  cyl  hd sec -  cyl  hd sec [     start -       size]
------------------------------------------------------------------------
 1: EE 1023 254  63 - 1023 254  63 [         1 -  312581807] <Unknown ID>
 2: 00    0   0   0 -    0   0   0 [         0 -          0] unused      
 3: 00    0   0   0 -    0   0   0 [         0 -          0] unused      
 4: 00    0   0   0 -    0   0   0 [         0 -          0] unused      

Diskutil shows:

/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *160.0 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                  Apple_HFS Heinen                  159.2 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

Does anybody know how to fix this?

Thanks in advance. Gerben

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