Need Help:Accitentally formatted hard drive to FAT32

Its my internal Hard drive not External, apple wont boot only shows the grey screen & pointer when I hold down the "option" key
 
OK follow these steps.

1. Start the install built (from the OS X install disk) and stop right before it starts installing and look near the top of the window for a Finder like bar.
2. In that Finder bar look for the menu item Disk Utility and use that to format that drive for OS X to install on it.
3. Then proceed with the install.

Good Luck.
 
Like I said earlier, the machine won't boot the OS X disc or any, no options are displayed in the screen, just blank.
Are their any keys I can hold down on start up? I've tried "C", Option, D
what can I do?
 
Found the problem, I installed a new hard drive from another computer & the computer works.
I then installed the faulty HDD in the other computer and didn't work
 
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