MacBook Pro 15" Retina Battery replacement
MacBook Pro 15" Retina Display Mid 2012 Upper Case Assembly
Answer to "hard drive is failing. now won't boot"Danny, It is hard to help without another Mac, especially if you are sure the hard drive is failing. If there is a Mac repair shop, not Apple, in your town maybe they could help you. They would have the tools to replace your hard drive and potentially recover some of the information/data from your old hard drive. Wish I could give you more. There are several others here who might have a better idea. PS: Apple is not bad, but the cost to replace your hard drive might be steep. Just my opinion.
Answer to "Why is there no audio recorded with my videos?"You may have accidentally "Muted" the sound or lowered the volume. Check page 49 of the user manual. A link is attached: https://support.usa.canon.com/kb/index?p...