that happens to my board too (rampage)
usually due to settings it didnt like
what i do is put one stick in the furthest slot, and hit the juice, it usually reverts to factory settings and i can proceed to do my thing. my p5k was the same way heheh. i know this might sound crazy, but one way you can prolong your boards life is to leave it on all the time, only shut it off for maintenance. when you pwer up your system, you are basically shocking it to life. plus the thermal dynamics of being on and off, themal contraction comes into play, things move a lil and one thing leads to another, and next thing you know bad words you might not have known you knew are suddenly everywhere.
i7 970|Noctua NH-D14|Giga UD-5 Rev.1|6GB Adata 2000G|Asus GTX570|Auzentech Prelude|WD64GB SSD/1TB Black|TX850