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Message: <blockquote data-quote="chosenman" data-source="post: 1325818" data-attributes="member: 223318">Hi, I am new to Macs after many years with PCs. I have an older iMac (white plastic) updated to Snow Leopard without any problems until now. It froze whilst downloading latest iPhone update through iTunes last night. I forced a shutdown with the button on back of screen.Today, it will not boot up, help!After pressing the button, it chimes, then grey apple logo and spinning ball. At that point I get a strange screen, see picture. <img src="http://i15.photobucket.com/albums/a364/chosenman/photo.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />I have tried starting in safe mode and it runs without probelm, although there is a pattern beneath the cursor.Can someone help please?</blockquote>