Cable Box Issues

I was wondering if you could help with the following problem. I own an older digital cable box (not the mini box). It recently shut down and restarted on its own. When it came back on, I didn't get any sound. I turned my box around to see if the cables were secure. When I did that, some of the cables were accidentally detached from the cable box. I reconnected everything and now, I'm not getting a television signal. Do I need to get another cable box? Do I need to upgrade to the mini box?

Thanks,

Paula Krueger