The good news is your data is probably still there and can be recovered. It also means that we can probably still find a solution without having to replace your Mac all together. The bad news is that most of the time it will be more than one repair session and requires a 72-hour time frame before we’re able to get the Mac back to you. We may have to do data recovery. We usually have to replace either the hard drive or a hardware component like the logic board and sometimes the repair cost will not be worth the Mac itself. Usually what this is a sign of is a update gone horribly wrong and or a update that wants more hardware than your Mac can give it.