This might seem like a dumb question, but do you have KDM installed? If you do have it installed, try re-installing.
AMD Phenom II 64 X6 1090T Black Edition
8192 MB DDR2 RAM
nVidia GeForce GTX 660 w 2048 MB DDR5
Sabayon 2014.x 64 Bit KDE
"Better to remain silent and be thought a fool than to speak out and remove all doubt." -- Abraham Lincoln