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Hi guys.. Sorry I dont have all the software info but.. A few days ago my Mac started freezing while using safari.. I eventually got it to stop by restarting and doing command v to bring up the black screen with the white text.

Same thing today except it was freezing while trying to restart. I eventually got the black screen to come up, but at the end it says this and won't start:
Jnl: unknown dev:flushing f's disk buffer returned 0x5
Failed to issue COM RESET successfully after 3 attempts. Failing..
Disk0s2 media is not present

Any advice? Thanks