If you bought it from somewhere take it back. If you built the machine, take out the RAM and boot. Does it beep? Good. If it doesn't the MB might be bad. If it beeps, power it off, and put one stick in. Try to boot. If it doesn't boot, but beeps, power it off, and try the other stick in the SAME slot. You are trying to see if it is RAm that is bad. Let us know what you find!