Apple's new Core i7-based iMac might be a performance monster, but it looks like it's having some problems getting out of the gate: in addition to those previously-noted performance issues, a quick glance across Apple's support forums and on other Mac boards around the web reveals that machines are showing up DOA and / or with cracked screens. We're a little more familiar with the DOA issue, since the new i7 we just bought doesn't boot at all, but the cracked screen issue seems to be equally common and mostly affecting the bottom left