I purchased mac pro 2 model no# a1186 few days ago with a new Hard drive . Now im trying to install os x from usb. i made bootable usb through another mac mini machine by formatting it through disk utility and transfer dmg OS X lion 10.7 in it.
Now issue is that i cant boot from usb and the Hd is new, nothing in it so how to boot usb on mac pro 2. I have tried key such as cmd (alt) + R key but nothing happening. Its just shows grey screen and after few seconds question mark symbol blinking. And when press and hold "R" key . it just shows a mouse cursor on screen and nothing else. Please guide me how to install OS x in it. Im in urgent.
PS : am i making any mistake during making bootable usb or whats the key combination for booting mac pro 2 to usb?