As usual I am going to ask if this PC EVER worked, or is it a brand new build.
To me, RAM doesn't matter, you should be able to get into BIOS with 0 RAM.
CPU dead, well nothing runs BUT the LED on the Mobo usually denotes it's receiving power, THAT'S it, that's all it's telling you, but then I'd consult the manual just to be sure.
Answer my 2 questions then we can proceed further.