Probably not. Something might have just gotten screwed up when you had the power cut. If everything is running fine now there's probably nothing to worry about. I had a similar problem once with a PC and it turned out that it was just a failsafe message and it had changed the settings back to default just to be on the safe side.
How is it covered? If it is covered with a solid piece of plastic that doesn't look like it is removeable chances are that there's no HDMI port behind it. OTOH if it's just covered with some sort of sticker it's possible that they might have just missed it on the way out of the factory. Did it specifically say that the Laptop included a HDMI port when you bought it?
True but in my experience they dry quickly and Arctic Silver 5 is designed to be stable for a very long time which might mean less hassle down the road.
Not all thermal grease is created equal, look for some reviews if you are planning on installing some. Arctic Silver 5 is generally considered a good benchmark.
It might be a graphics driver issue; try reinstalling them or finding a more up to date version from the ATi site. Failing that also make sure you have the most up to date version of DirectX.
Check that the pins aren't already "clicked" into their locked position.; if they are then rotate them and try again. It is imperative that all four pins are clipped in. Do not "improvise" with screws. Since the heatsink has probably been sliding about all over your CPU when you reseat it you would be well advised to clean off the old thermal transfer compound and apply something like Arctic Silver 5 or something similar. Clean the old stuff off with something like Akasa TIM clean and just a lint free cloth or something that won't leave anything behind and is soft enough not to scratch the bottom of the heatsink. As already advised, take the board out of the case and install the heatsink there. Make sure it is on a flat and non conducive surface, the foam backing that came with your board or the anti static bag will do just fine. On a flat surface I wouldn't worry too much about breaking the board.
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