Using Internet Recovery, I did a clean install of Lion, but my iMac (27" i7) refuses to boot. Here's the history: I was working the iMac pretty heavily, doing video processing, when it suddenly went to the white screen of death. Just a white screen, gray Apple logo and a spinning gear. I left this for a bit (the spinning gear suggesting it was doing something), but it never came back and simply returned to this state after a forced shut-down and power up. I tried Internet Recovery numerous times, but never got it to boot despite reaching different progress points each time. I wasn't worried about a wipe and clean install as I had a full Time Machine back-up. I wiped the main HD partition and tried to reinstall Lion, but it wouldn't reboot into the installation process. I repaired and wiped the entire HD, got to the point where I could re-install Lion, but it hung during installation. Out of sheer stupidity / perseverance, I tried again and got to install Lion this time, but it failed to boot after completing the install process (WSOD again). I repeated this last step once again, installed Lion, but upon boot it said that the Lion install had failed. I clicked "Continue" (the only option on screen) and got the WSOD again. I powered down and back up and got back to the WSOD, but now it shows only a gray file folder icon with a "?" in it on screen. Not even a spinning gear. I am at a loss. The HD is not damaged or corrupted. The hardware overall appears fully functional. There are no peripherals attached other than a wired mouse / keyboard, and an ethernet cable (connecting through an up-to-date AEBS). Help me MacRumors Jedis, you're my only hope.