Hey,so basically I turned on my laptop and it began loading up as usual, with the tone, then the apple logo then the spinnig wheel, then it showed a grey prohibitary sign? I've read a few posts about this but so far I havent found a solution that has worked - As far as I am aware it is not a HD problem as under disk utilities it says the HD seems to be ok with no problems. Any ideas what I can do to fix this? Im a pretty new Mac user too so any help at all would be appreciated!!