actually i had to do a repair disk on not the partition but the main disk for it to finally work. i just managed to boot in. Is there some kind of boot image i can load on to a usb that automatically repairs permissions and disks? Having to load up a yosemite install disk to repair disks is kind of tricky for my boss to do. ( His laptop I'm working on ) This is the second time this has prevented booting up to osx.
Thank you - David