Hi, Having some serious issues here! Also worth pointing out that I am not hugely computer literate. After downloading 2 updates this evening ( not sure what they were, just did it through software update) I followed the prompt to restart my iMac. It then got stuck on the grey apple logo screen with the spinning grey/black wheel. Making no noise at all, for well over 30 mins. I then forced in to shut down by holding the power button, which it did so. On powering back up, I again got the grey apple screen with the spinning wheel, but also a long oval bar which started to fill, then reset itself, before powering my iMac off completely. The problem keeps happening. I have read several other help topics that almost match this, and followed advice. I have rest the PRAM, and tried staing in safe mode. When following the track of safe mode a message appears in the text saying "Incorrect block count ...should be 8 not 1" And "Macintosh HD could not be repaired " Amongst much other text, and then turns off. Is this as bad as it seems..? I am running Snow Leopard on a 4 year old iMac (much more than that I can't say without turning it on....sorry) All help gratefully received. Thanks.