What should I do if my motherboard won't post?
Remove any recently installed components. Reset CMOS. If that doesn't fix the problem, check all cables are plugged in completely. If that does not help, reseat the graphics card, memory, and CPU one by one.
Instruction: What should I do if my motherboard won't post?
Context: 
Response: Remove any recently installed components. Reset CMOS. If that doesn't fix the problem, check all cables are plugged in completely. If that does not help, reseat the graphics card, memory, and CPU one by one.