my english is not good i hope u can understand what i said about the situation about 4 days ago,i opened a psd file in may mac,but my mac worked very hard at that moment.and the cursor turned like a coloful circle then i shut down the power after couple of hours i opened the computer again,but terrible thing happened it could't start up,just a blank screen, a folder with a symbol "?" in it. someone told me maybe there was something wrong with the hard drive so i put the system disk 1 into the computer and use the Disk Utility but it can not find my hard drive!! Disk Utility show that only a cd,no hard drive what happened with my mac? can anybody help me?