I have a Toshiba Sattelite Pro 660, when I switch it on I had a black screen with only the Toshiba on screen. I couldn't start the Recovery Mode it frooze too. After checking in on the Boot Menue to change to boot from CD it came up with this error: Operating System not found. I've tried a well established Boot disc, but even that freezes before the Repair tool comes on. Any ideas?