I'm Desperate - None Of My Magic Spells Are Working! What's Going Wrong?

I keep getting "desperate help" messages and people asking "Why doesn't magic work for me? I'm desperate! What's going wrong! None of my spells are working!!!" There is a really simple answer to this that is so, so important in magic, but so few people seem to know about this. Here is in a nutshell what happens when when your spells don't work, why they don't work, and most importantly, what you need to do to get your magic power up and running as it should.