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Grab a motherboard speaker. Listen for beep codes and they'll generally tell you exactly what's going on. Here's one:
http://www.amazon.com/PC-Internal-Mini-Onboard-Speaker/dp/B002W4M0DW
Also are you trying to swap out power supplies? Those tend to be the first things to go with your big...
Grab the 620w Seasonic, just a few bucks (less than $10) more and an extra 100w. I'd also say grab a 256gb SSD then a regular HDD for storage, I prefer WD black myself but whatever floats your boat! Other than that, looks great to me :)
How old is your PSU? Might be having trouble coping, though you *should* just be okay. As mnewxcv said I'd make sure you clean out your drivers first then reinstall. Also double check the PCI-E power connectors are attached to the card.
At 4k I like to think you'd like to keep the option open to add another card later. I don't know if this has been touched on in reviews, but can't see there being an option to crossfire fury x's with that cooler that takes up a fan slot. With the 980ti on the other hand, just throw in another...
Wow I honestly thought AMD was gonna bring something strong to the table, especially considering their "leaked" benchmarks. I've stopped listening to marketing a while back thankfully, but this whole misleading "built for 4k gaming" bit has to stop.
I used to be ASUS only. I'll spare the life story and answer your question: No, it generally doesn't pay to be brand loyal. My past few motherboards have been ABIT, evga, gigabyte, and now MSI. Find features you like, check some reviews to make sure there's no obvious problems, and forget about...
Will they go bankrupt? Maybe. Will they go under? Highly unlikely. Competition is needed...and I'm not saying that for the benefit of the consumer, I say that for the benefit of Intel. You think they want a Microsoft-style Monopoly court case? Nope. It's much cheaper for them in the long run to...