I know there's probably hundreds of topics created about the black screen issue with PS3s upon switching them on. I've read half of them in trying to fix mine, but the issue is deeper than the system not turning on or freezing.
When I first experienced the problem, I thought it was just the usual black screen that could be fixed by a reset, so I did that and on the restore menu chose 'Restore Defualt settings'. Once this process was completed I tried again but it still blackscreened upon powering up. So I this time I tried the 'Restore file system' option in case my hard drive was corrupted, this wasn't the case and my PS3 still black screened, so lastly I tried the 'Restore PS3 System option' (as a last ditch attempt). Still I got the blacscreen, so I started thinking it was more likely a problem with the display settings.
I hooked it up to my TV via Composite (Scart) and low and behold it worked. I then tried to change the display back to HDMI via the settings menu. However when I selected the HDMI option and changed my TV back to HDMI, the screen would black out and not pick up the HDMI interface. I've watched many Youtube videos and tried all the power button hold down configurations you can think of, but it just won't change over to HDMI. Is there anything you guys can suggest before I return it to SONY for repair/ refurb?