asus laptop not booting

The only way to start my old ASUS x54c laptop is to reset the bios by removing CMOS battery plugging in the charger. It turns on as soon as power cable is plugged in, but won't start when power button is pressed ? Any idea why this is happening and how to fix this??

I was sent in an ASUS Q302L laptop to look at and it has a pretty strange problem. Usually for these sorts of things I update the drivers, the BIOS, and upgrade something (in this case they wanted more RAM so I put in an extra 8gb stick). Everything seemed fine until I updated the Intel Wireless...