I know this has been brought up in multiple threads (don't bash me pls), but I've read through them and tried various recommendations, but to no avail. Disclaimer: I'm a Mac fan, just not an under the hood wiz (PCs - I can troubleshoot in my sleep). The problem: Attempted upgrade from Sierra to High Sierra. It went through the normal motions, but upon rebooting and after I entered my login credentials I got what I understand is a "panic" screen (see attached). Note: this MBP has a standard (non-SSD) 500GB HD. Reboot, reboot, reboot - same result. So, I go the Command R route and attempt to Reinstall MacOS (no - no Time Machine backup - there's nothing I need to keep on this Mac). It shows High Sierra as the installed product (like it succeeded upgrading from Sierra). I tell it to install on the HDD ("McIntosh HD") and then unlock it with my password and wait. It fails (see messy installer log file attached). From my limited Mac knowledge, I assume the High Sierra installer is trying to force convert APFS on a hfs disk that Just Says No. Ok - probably not that. I did find info out on the innerwebs about entering the following command through Terminal to bypass the hfs to apfs conversion: /Applications/Install macOS High Sierra.app/Contents/Resources/startosinstall --volume /Volumes/Macintosh HD --converttoapfs NO. It didn't work - received an error to the effect of no such directory. I decided to do the Internet Recovery method - assuming it would reinstall the original version of the OS that came installed on the machine when I purchased it (I can't remember which). Nope - it did in fact go into Internet Recovery mode, but High Sierra came up for the reinstall and the end result was the same as mentioned above. I'm just about at my wits end - this thing is beginning to look like a viable doorstop. Any help would be greatly appreciated!