With the unit powered ON and the disc tray empty, press and hold the STOP button to see if the unit resets. If it does and you still have No Signal, try connecting the TV with composite (yellow) AV cables and switch the input to AV to see if you're able to get a signal through the composite cable.

If you are, try changing the resolution in the menu and switching back to the connected HDMI or component (RGB) input to see if you're able to see the menu.

Keep me posted.