Hi, Ok so about a week ago I was using my computer and it froze, I waiting a while and it did nothing so I forced quit and restarted. But to my suprise nothing really happened. It went straight a gray screen with nothing on it and it sounded like it was trying to start up but couldn't. So I inserted my Install Leopard disc (which I upgraded to around 2 -3 months ago) to try and boot up the computer & check to see if there was anything wrong. When I tried to do a repair it kept telling me that "Invalid B-tree node size" and it would not be able to repair it. Called Apple help and they told me that I needed to Parition the drive and then reinstall leopard onto my computer. (they just gave me the basic's as I dont have cover and didnt really want to pay). So I got the information on how to do that and went on my way. The first couple of times I tried to partition the drive (then varify the drive) it would come up with different errors. And that meant that when I went to reinstall leopard it would get about 80% through then tell me that it was unable to install some files onto my hard drive. I thought maybe I was doing something wrong and every now and then would try partitioning my drive again to see if it would install leopard. Until last night it finally was able to install leopard onto my computer - and I was thrilled. So it once that was done it needed to restart itself. I left it as it was to do its own thing. But when it went to start up it wont go pass the apple startup screen, and I cannot seem to find out why!!! I have done a pram reset (i think thats its) and started up in single mode - to see if there are any other errors & have done a million repairs to double check as well. But still nothing. I have left it on the startup screen for ages to see maybe its just taking its time, but no nothing!! Can someone please help - is there something that I'm forgetting to do first???