drag out the motherboard manual, it will tell you to unplug the power cord, remove the battery, and move a jumper from one set of pins to the other for a while.
also, check that you have the memory in the correct slots, read the manual.
did you install the operating system with more than one drive installed?
make sure you have the boot drice plugged into the correct sata port.
clearing the cmos is on page 1-27 of your manual, set the thing on a desk on it's side to do this, while your in there be sure your boot drive is in sata port 1 or two.
check the memory installation instructions in your manual, install only two sticks of ram for right now, the slots are numbered from the cpu to the outside of the board, next to the cpu is slot 1, put a stick of ram in slot 2 and one in slot 4, the one furthest from the cpu.