crwdns2934241:0crwdne2934241:0 mayer

crwdns2934249:0crwdne2934249:0:

You will need to try to boot from an external USB device with a know good operating system on it.  Plug it in and hold down the Option key and select it.  Then go to Utilities > Disk Utility and see if the internal storage media can be repaired.

crwdns2915684:0crwdne2915684:0:

open