Hack boots to pluses in verbose (Z87-G43 Gaming & i7-4770)

[WindowsRules]

Hey guys. I had a mostly-working system (minus waking from sleep) a few months back, in June or so. After not using the Mac side (it's on a separate hard drive than my main Windows setup) for a while, I came back to it and it no longer works at all. When I add the -v flag during Clover boot, I'm just getting a row of pluses, and then all activity just stops. I'm stuck at a black screen with a row of pluses. I've tried flashing a few different BIOS versions (A.7, A.6 both PM patched and without), but nothing works. My system doesn't have a dedicated graphics card, and none of the hardware has changed since it stopped working. In addition, booting from the Unibeast installation USB yields the exact same result: a row of pluses followed by no activity.

MSI Z87-G43 Gaming
Intel i7-4770
HP LV2311 Monitor
Logitech Speakers
HP Elite Keyboard v2
Logitech T650 Touchpad

 

[WindowsRules]

Any ideas? I can't figure out what could have changed between when the system booted (early June) and now.