I didn't want to bore you with details...
Why I can be sure about the relation to the update is: it was standing on my office's desk, I did the update and after it was finished I closed the lid.
When I returned shortly after, I opened the cover, pressed the power button and there it was: the fans went on for a couple of seconds and nothing on the screen. Had to push buttons like forever to have it cold-started. That was when the issues started.
A very persuasive portrayal of good hardware gone bad. But very strange, a one in a million adverse combination somehow got triggered by one (or more) of of the numerous Feb blobs. It defies comprehension.
Today, I feel your pain. This morning attempting to start the SP2, it wouldn't start whichever buttons I was pressing, just sat there blankly. I felt entirely helpless for a minute or so. Finally after a long time, almost grudgingly, the SP2 booted up. Weird. No fans were whistling
And I see it in the event-log that there are always several Type Cover driver issues. When I de-install that driver, the Feb.14 update appears again in the update list, so these must be related.
Well, there have been other apparent driver interactions, like the peculiar issue of cold booting followed by CPU utilization of 30%. This only occurred with mSD card in slot and sound driver activated. What's that about?
BTW: I LOVE re-installing computers. I'm maintaining PCs for all my relatives and I almost enjoy if they broke something, so I have something to fix (yes, I'm a pervert). But when it comes to the SP2, it appears just so pointless, it seems like fixing something which can't be fixed. However, since this time I seem to be alone with my issue, I might go for a replacement.
Not a "perversion", merely an "eccentricity". It's understandable that it would be a pleasure to be so helpful to people you care about. To them the computer is an opaque mystery and the ability to make it work is the absolute equivalent of magic. And you are the magician.
With your own SP2 it
is pointless to go one more time trying to fix what is obviously very broken. Go for it, replacement is long overdue. May your new SP2 live long and well!