okay, so last night i decided to try and install windows, well it went wrong, formatted the entire hard drive and formatted it as ntfs. now i want to re-install os x but it can't find the location to write to as it can only read ntfs. basically the computer has been rendered useless. when i go into disk utility via the install cd, i can not erase the drive. i am currently on my mac book. so i can access the drive via firewire. but still going through disk utility via the macbook is the same. could someone please help me just format the disk to hfs+ or tell me how to get it back to a format i can install mac on. I read something about a linux disc i could make and boot from that and format the drive from there, but i know nothing else about it. thank you.