Hackintosh previously working fine, but now won't boot

Specs: Gigabyte Z77-DSH3, i5-3570k, nvidia GTX 970

What is normally a speedy boot into Yosemite from Clover grinds to a crawl and then gets that "no symbol." I've made no changes to the boot configs or the system in general in the past day.

This has actually happened to me before; and while I couldn't figure out the cause before, booting up without cache would fix the problem. Unfortunately, that didn't work this time.

When running verbose, I get the screens as follows: https://imgur.com/a/iVdcF

I gotta say, I'm in over my head here. Any thoughts? Thanks in advance.