Comes on but blank screen - Sony Playstation 3 (PS3) Console

Perform the following steps to reset the Video Output Settings.

1. Make sure the HDMI cable is connected to the HDMI OUT port on the back of the PLAYSTATION 3 system. Connect the other end of the HDMI cable into the HDMI Input port of the TV or display monitor.
   
2. While the PLAYSTATION 3 system is in standby mode (red light on the front of the system), hold down the touch-sensitive power button on the front of the system until the system goes into standby mode again . (So the light cycle would go from: red light --> green light --> then back to red light). This will ensure that you have held down the power button long enough to reset the Video Output Settings.
   
3. Turn on the PLAYSTATION 3 system and once the system finishes powering up, the Video Output Settings will automatically reset to the standard resolution (or detect the current display output settings of your TV/monitor).
   

Ive done this and then I had put my HDMI lead in and did a system update... It notified me that it found a HDMI source and asked if I wanted to switch to the HDMI source, I did and it worked.!!! BONUS!!!!!!