Steady green light is usually a sign of the motherboard receiving power. However without knowing what motherboard you have i can't be 100%.
I know the issue isn't RAM. A computer can still POST, even without RAM.
RAM, HDD, Disc Drives at this moment don't need to connected.
Only motherboard and CPU and PSU.
Did you mess with the front panel connecters at all? They basically connect to the motherboard from the case. Usually control lights on case and POWER button.
You got shock while changing the RAM? or Power Supply Unit?