some how i managed to completely ruin my sharing permissions on my computer. computer number 1 (my computer) cant access its hard drive - it had a little minus sign on the folder - when i restarted it i only get to a blue screen. i tried this... http://forums.macrumors.com/archive/index.php/t-375901.html and now i get a grey screen, i've tried putting the OS X disc in and it doesnt pick it up. the weird thing is i can access my hard drive through my other computer (computer number 2) when comp 1 is sitting on the grey screen. is there a way i can change some text file on the hard drive to change all the sharing permissions or something???