Chosen Solution

Computer will not power on. I have reset Pram, SMC. There is an amber light on the ac adapter. I did change the hard drive and added ram. It ran just fine. I shut down the computer, now it won’t power up.

check the top case connection to the logic board.

Try reseating the RAM.

check dim slots ,ram and ,try reseating the btry ,and try dispose antistatic …also try and let btry be out for at least 5 minutes