I have a 15" Silver/Titanium Macbook Pro. When I boot up all I get is the blue screen. Nothing else. I have tried booting from a CD and in firewire mode. All I get is the blue screen at the start. I get the bootup sound but nothing else. I have tried zapping the pram and removing the battery. Same result. Any ideas?
Try starting up in safe mode by pressing and holding the key while starting up, and continue holding the key until the login screen appears. If this works, the words "safe mode" should show up in red and you should be able to log-in.