Basically I was in bootcamp and I selected start installation. The mac went to reboot but it then said there were updates to install, so I selected ok to install. They installed and then the mac rebooted and its now stuck on the opening screen but completely blank. Then after a few mins a folder with a question mark comes up but can't get any further. I also have refit installed, so don't know if this could have caused the issue clashing with boot camp. I've tried holding down command to get into refit and select osx drive but it won't work. I've also tried my snow leopard disc and that won't load. I just want to be able to get back into osx. Where should I go from here?