Asus motherboard A2 error

[Deathatroke]

yeterday I dicided to build a pic.i was super nervous because this is my first build.itwasn't very hard,but there was motherboard error.i have Asus maximus vii ranger.the first error was A2.I googled the problem but I could not find a solution.i removed the graphic card,in using gtx760 2gb ram.i restart the pc again and finally got into the bios.installed my windows 7 home premium.after installing Os and put in my graphic card,and the error A2 comes back and the monitor is black,can't even go to the bios. I also noticed than LED for bot drive was flashing red.i unplugged my sate cable and plugged back in but LED keep flashing. To make things worse the bios is telling me the CPU is overheating here the specifications:Intel i5 4670k,corsair vengeance DDR 3 8GB ran,corsair 600 watts power supply,asus maximus vii ranger and gtx 760 2gb ram. I apologise for any grammatical mistakes,English is not my first language