Let me read this thread later and help out, but for failed updates - especially if you shut down mid-update - can you try windows restore? Boot and jam f8: you'll get to Windows repair, from where you can pick an earlier date to restore from. Note your files will not change, only windows files, so don't worry about losing the latest beiber posters you've downloaded.
I'll work on the rest later.
My guess is the front panel doesn't work because of fucked up inf files from an improper shutdown during an update, which is causing windows to think it's got new hardware and thus needs a reactivation.
That said, if your power button works to turn ON the computer, it's not a hardware problem. If it doesn't, then it is a hardware problem and we'll dive deeper.
I'm going to ask you questions later that will help me get some answers.