Like the title says. I knew the risk and tried anyway, so now my mac is stuck at the apple logo screen with no circling wheel. The short story is last night I saw a posting about people modifying their boot.efi to allow a macbook to boot into 64 bit kernel. The macbook model was different and mine was a 4,1. So far I've tried copying the backup boot.efi from lion into the corresponding directories that were affected and repairing permission but no go for me! I can boot into the maintenance partition and try to reinstall lion again but would that erase what I have? Any advice as to how I can get this to boot would be greatly appreciated and I do promise to never mess with this again!