I was installing an update for my macbook pro (early 2011), I think it was 10.6.8, anyways as I restarted my laptop to install the updates it got about 90% of the way through and then said there was an error. It then restarted my laptop and a grey screen popped up with the apple logo, then I got a loading bar which get part way along (I'd say about 1/10 of the way) after which it shuts down my laptop. I have tried multiple solutions including trying to boot up my system with the snow leopard installation disk, it then tell me I need to restart my system in 5 different languages including English. I have also tried running to fsck command in single user mode however I can no longer access this or verbose mode, and I have tried to bypass the primary start up volume by pressing Option-Command-Shift-Delete with no luck, I have tried to start it in safe mode but it just comes up with the same screen as trying to use the SL disk. If there is anything that can be done I will be very glad. Thanks in advance