What sort of cables did you originally use to hook up? It shouldn't matter the supposed value of the HDMI, there isn't much difference between the cheap and Monster.
Did you use cables other than HDMI at first, like the composite cables that they include? If that is the case the PS3 still thinks that is the output. Hook those up again then go into the Settings menu and select HDMI as the output. Then power down and switch over to the cheap HDMI cable and power up again- you should get a picture with them now.