You won't have problems. Just RMA it. It was weak and would have failed anyways, or died completely coincidentally. My bet is on the latter.
Forget the overclock in this case, but don't use that method again. Any OEM OC util or method is always bad. Flashing the BIOS in windows, even when given a utility by the OEM, is bad and sometimes kills the motherboard. When an OEM gives you drivers, it's usually best to use newer ones from the chipset manufacturer.
Basically, anything the OEM tells you to use, you ignore and research for a better option. There are a few exceptions to that, but not many. This REALLY goes for ASUS. Never use anything ASUS. They deviate from reference designs and use their own crappy utils, trying to distance themselves from other board manufs. Just like their annoying deviations, the utils are just as irritating.
If you want to know how to overclock the
real way, then go to overclockers.com forums
Overclockers Forums and research your motherboard. I guarantee someone else there has it and has overclocked it. Additionally the chipset will be a common component in other boards, so there will be discussion there as well. Many threads will also cover chipset voltages + CPU voltage + other tweaks as a combined effort.
In other words, always overclock by BIOS. Test it every time you make the slightest change, and remember your settings. Once you have a good stable speed you like and is 100% stable, leave it that way and enjoy your super fast rig
I ran my Q6600 @ 3.6GHz daily speed for a year. I clocked it back to stock because I don't use it often enough or hard enough to warrant the wattage increase.