Chosen Solution

The macbook pro won’t load past the apple logo screen, I tried command+s on start up, and I tried command + v on startup, It showed me a repeated error message jnl:unkown-dev:do_jnl_io:strategy ewrr 0x5 jnl: unknown dev: could not read 512 bytes for the journal header. hsf: late jnl init: failed to open/create journal (retrieval 0) hsf_mounthfsplus: hsf_late_journal_init returned (22) hsf_mounthfplus: encountered error (22) hsf_mountfd: encountered failure 22 hsf_mountroot: hsf_mountfs returned 22 rvp (0xffffff800badff00) name (Unknown device) cannot mount root, errno = 19 rooting via boot-uuid from /chosen: 3CF4A65E-EE84-3174-B212-9014999EF1AF waiting on IOProviderClassIOResourcesIOResourcematchboot-uuid-media Got boot on device = IOService:/AppleACPIPlatformExpert/PCI0@0/AppleAPIPCI/SATA@1F ,2/AppleIntelPchSeriesAHCI/PRT0@0/IOAHCIDevice@0/AppleAHCIDiskDriver/IOAHCIBlock StorageDevice/IOBlockStorageDriver/TOSHIBA MK5065GSXF Media/IOGUIDPartit BSD root: disk0s2 disk0s2: I/O error 0 [Level 3] [ReadUID 0] [Facility com.apple.system.fs] [Err type IO] [ErrNo 5] [IOType Read] [PBlkNum 515184] [FSLogMsgID 2064894641] [FSLogMsgOrder First] 0 [Level 3] [ReadUID 0] [Facility com.apple.system.fs] [FSLogMsgID 1051684345] [FSLogMsgOrder Last]

Try a safe (shift) boot. Try booting to your install disk or AHT (D boot). If this answer was helpful please remember to return and mark it Accepted.