Greetings, I have a MacBook Pro (came with osx 10.5.5) and I installed boot camp and then I installed a Windows 7 partition, I didn't want mac OS anymore so I deleted it..... now that isn't when my problem started, but later on I wanted to reformat my whole computer, and it proved difficult because MacBook's don't have a PC BIOS and I didn't know all the commands for the start up utilities at this point in time. So I downloaded a program that runs at the windows startup screen and then runs a partitioning program before windows fully starts. I deleted all partitions on my computer with it. I went to install my snow leopard disk not knowing that I needed my original disk that came with the MacBook. I would hold down C and the screen would go black, and it would say insert a bootable disk, and then press any key. Well I tried this for a while re-inserting my snow leopard disk. Also I tried holding the option key to install from USB flash drive but nothing would show up not even the HD. then I reset the PRAM and found out I needed to use the original disk that comes with the computer, I tried that after I reset the PRAM and it wouldn't even get the to black screen where it told me to insert bootable disk and press any key. So now after I tried using the 10.5.5 osx disc and it gives me the flashing ? folder for everything I try, disk utility, recovery mode, hardware test (yes I held D key and had applications disk in tray.), holding option key, holding C key, all just ends with the flashing ? folder. Could I have deleted the start up utilities on my computer when I reformatted? if so how can I re-install them if I can't get the computer to recognize anything? Any help would be great.