I have attempted to overclock for the first time in my life, and I'm experiencing the same issue. Either I am doing something wrong, and if so, would wish that I, an overclocking noob like many others, should've been warned of potential dangers, as seeing my screen blackout and having to shutdown my PC via the power button is a little concerning. Even if we're not at fault, EVGA's software is lacking somewhere - I can't even change the LEDs on my FTW!
 
For those that aren't aware, the custom set LED colour is reset back to default after every reboot - another annoyance I might add!
 
It seems I won't be overclocking anytime soon - but I have faith EVGA...you can do it!
 
If it matters at all, I boosted the clock speed +500, and nothing else - I later realized that not raising the power target may have something to do with this. I also uninstalled and reinstalled the software, but the issue persists - I attempted to delete the software files, as I'm assuming my boost settings are currently saved and utilized upon software startup, but alas, despite all the changes made possible for user permissions, the bloody SYSTEM is preventing me from doing so.
 
EVGA, send the knight in shining armour you sent me a poster of - we need a solution!
 
P.S. I may try one of those file unlocker programs and report back in a bit.