Black screen, Looping audio fx [CRASH]
I was about 25 minutes into a normal draft game on SR, and I called for /ff, which wasn't answered by enough teammates to close. So I continued trying to defend base and died (~30s after typing /ff; when it would normally close itself), and right about then the screen went black. Audio continued to play so I thought I had connection and just a video issue. I tried to alt-tab but that did nothing. Then I ctrl+alt+del, which after a long delay brought up that menu, but trying to open task manager from there just returned me to black screen. By this time, I'd heard dragon die 3 or 4 times in the span of a couple minutes so what sounded like fighting was just a loop of the audio generated around the time of the crash. Since ctrl+alt+del failed I had to power off. The game was already ending but there's a good chance they report me for leaving x_x.
I'll only know if this is replicable after playing again; this was my first game since today's update (back on old draft system). No screenshot or bugsplat for the reasons mentioned; if it happens again I'll try to record the audio looping.
On Windows 7 64-bit. LoL 0.34.0.18 Patch 6.1
My search of recent crash reports included black screen issues but they were during or right after queue.