I have a macbook pro running the lastest OS version (I can't give you the number because I can't get my laptop running). It was responding slowly to things like typing, opening email, etc. so I read that I should startup in safe mode which will purge some files and then see if it helped. Safe mode started up, asked me to select a user, and it opened up fine. I then restarted and got the circle with a line through it. I've now started in recovery mode and verified and repaired my Samsund SSD and it says the volume appears to be ok. FILE SYSTEM check exit code is 0. I can't get my macbook pro beyond this point. It still won't start, just gives me the circle with a line. Any help would be much appreciated. One option it offers on recovery is to reinstall the OS. Should I try that? Thank you.