It’s 3am and the #$%^&* won’t do what you need it to do. There is little chance of anyone being awake that can help you. What do you do? You help yourself that’s what. For guys like us calling tech support is generally a waste of time. Instead we look to a wealth of knowledge to solve problems. Here’s how you can help yourself.
Before you "try stuff" to recover a hard drive that won't come up on you Mac please listen to this podcast. What to do if your hard drive doesn't come up.