Aurora R7, blinking yellows light in start button

Hello everyone

Who can help me solve the problem Alienware R7? I had upgrade ram 16 GB to 32 GB and than changed optimize default in bios setting. But not coming boot menu. It is blinking yellows light in start button. I try to put back all original hardware and original windows as well. It is also not working. Someone can help about this problem.

My pc is out of warranty and limited service.