I have an older (2013) Dell Inspiron that won't power on. I removed the memory and reseated, tried with one stick in both slots and no memory at all. I turn it on, I hear the processor spinning, the 3 buttons in the upper right blick on in succession, then the system powers off. I have checked the dell support and they suggested unseating components like memory and hard drive and battery. Nothing is working. Ideas to further troubleshoot?