Steps to connect your system:-
If you are using an HDMI cable, connect one end into the back of your PS3 and the other end into the HDMI port on your TV.
Plug the power cord into the back of the PS3 and then into a surge protector (recommended) or wall socket.
Connect a USB cable to the back of your Dual shock 3 controller and plug the other end into the USB slot in the front of the PS3.
Press the power button near the disc drive (or flick the power switch on the back of the old PS3 and then the power button).
Bonus step: Sit back and enjoy your PS3!