Repairs Toro proline 36 blades won't engage

I have a toro proline 36 in mower that's "new to me" it's a 2003 that I paid $300 for. Got it home, ran it for 5 mins and the blades disengaged and won't come back on. Any help would be great thanks. Ps. Model#30178

Attached Images

• ForumRunner_20150201_184833.png (491.6 KB)