Is this a new build? Have you tried clearing the CMOS yet? If not do that for a minute and see if it helps.
If it does not then try an extended CMOS clear. Remove the PSU connection from the board, then press and hold the power on button for one minute, then remove the CMOS battery, then put a jumper on the clear CMOS pins and let it sit like that for 8+ hours. Then remove the jumper, put the battery back, and connect the PSU and try again.
Also, be sure you are connecting the 24 pin power cable, and the 4 or 8 pin CPU power cable. Just in case, you never know!
Also, did you ever try it with one memory stick, and no graphics card? If not try that before the extended clear CMOS
If none of this helps, you'll need to remove the board from the case and OFF the motherboard tray if it's on one. Then try to start it on a wooden table or cardboard box, if it starts there then you have a short somewhere in your case (Often there is one or more motherboard standoff's mounted that are not used, causing a short). So if this is the case, be sure to verify that you only have motherboard standoffs installed where there are actual holes in the motherboard PCB.
If that fails, you'll need to remove your CPU and check for bent CPU socket pins