Hi, I know its my fault.. I am newbie and no idea regarding Mac OS X.. My problem became worst. My Apple HDD for MacBook Pro 2009 was intentionally deleted on my Win Desktop Disk Management. I removed the HDD from macbook pro and mount it on my win desktop, deleted the partition and became unallocated drive. after that, I format it as exFAT file system. This happened because the first problem I encountered my Mac run super slow even though my disk size wasn't too large. I erased HDD partition in Disk Utility not knowing I didn't have any backup to do, too late to research on this. Upon my research: Internet recovery, dl transmac & Mac OS X 10.5 Leopard.dmg and make bootable usb, and other instructions but it didnt go, I have no backup and nothing happened. I also noticed in Disk utility, there's a disk 1 OS base system that i can't erase, I just wonder that it would be possible if I delete the partition of HDD. that is why i deleted it using win desktop. when I try to boot up again the bootable usb, nothing happened, not working at all with a question mark "?" blinking or the circle with / line inside. Game Over. My bad, I assume its just the same installment process with unix. It is pleasure if anyone can suggest workaround here. what am I going to do? thank you so much bros and sis!