Help! My machine suddenly won't boot

[AvaGardner83]

I have been running Mac OS Sierra with MultiBeast flawlessly for several months now, however I do have to manually select the drive from the boot menu on startup. A couple days ago the drive suddenly won't boot. The drive itself is fine, nothing happened as far as I'm aware, but it just won't boot. Thankfully I have an older build also installed, running Mountain Lion, so I can work in the interim. I have tried reinstalling the OS, and ran MultiBeast again, but nothing changed. Any advice would be much appreciated. Thanks in advance.

 

[BreBo]

Any advice would be much appreciated.

Boot your system in Verbose Mode and post a picture of your screen when it freezes/hangs.
At Clover Boot Screen press space bar and select Verbose (-v) and Don't reboot on panic (debug=0x100).

 

[AvaGardner83]

It hung several times and was running for several minutes. I wasn't sure which parts were pertinent, so I took a bunch of photos. Thanks for your help!

 

[P1LGRIM]

I wasn't sure which parts were pertinent, so I took a bunch of photos.

Sadly none of that.
Try disconnecting all of those other drives and see if it makes any difference.

 

[AvaGardner83]

Same result :/