I have a iMac G5 A1076 and i removed the hard drive and put it in a windows pc. I used Transmac to format it. But when i put it back in the iMac i cant get any of the boot buttons to work at all. I have also downloaded different types of mac os x and used transmac and usb flash drive and still get nothing. All i get is a picture box of a mac face and a question mark. Also i do not have the original mac os x disk either, Ive got 15 years experience in windows pc's from building them to software troubleshooting but when it comes to mac im a total noob, Can anybody help me ?