Ahh, so it looks like when I engage the mirror lockup lever the camera is firing at 1/500th of a second. This happens right when I engage the lever. Then, when I press the shutter button I get a "click" sound but the shutter does not open at all.
So, it is normal for the shutter to fire at 1/500th when I engage the mirror lockup lever? I was under the impression that the shutter should not fire right when I engage the lever, but rather afterwards when I press the shutter at whichever shutter speed is selected.
I apologize if I'm being confusing, it is kind of tricky to explain.