To set a good reference point, if the camera will allow, reset the camera using the instructions attached. Then try to take a few test shots. If unsuccessful, Try a hard reset. remove the lens, memory card and battery, set the mode dial to M (manual), and switch the camera to the ON position.Allow the camera to sit idle for 30 minutes. Then, switch the camera to OFF, re install the battery, memory card and lens, switch it on.
If the resets do not restore normal operation, then, unfortunately, an Error 30 indicates an internal mechanical failure and from the symptom that you have described, the shutter has most likely failed. The other almost equal possibility is the sub-mirror, but this normally fails progressively, starting with half frames until completely black. In either case, the camera will require professional service. You can set up a repair with Canon at the link below.
Please keep in mind that my diagnosis & solutions provided are directly dependent on the accuracy of your description of the problem. As with any "do it yourself" fixes, success is a "team effort", since I can't see or touch the camera, and relies on the customer's manual dexterity and ability to follow the instructions well.
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