My Asus X550C does not turn on, but the green charging LED is lit when I plug in the charger.
I changed the DVD drive for a second hard drive.
I tried to turn on the notebook, but it doesn't work.
I tried to disconnect even a small battery and hold the power button, but it didn't help. another idea?
Are you sure it isn't starting or only failing to start Windows?
Try pressing, Escape or Delete, F2, F10 and F12 to see if either BIOS comes up or an option to boot from a hard disk. Your change of the optical drive to another hard disk may have altered BIOS and now it needs to be told where the system is.