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The Mac Pro First Generation is an Intel Xeon-based workstation computer manufactured by Apple Inc. The first generation model includes the machines from 2006 through 2008.

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Black screen on Start up Cant install OSX

Hey guys, I have a Mac pro 2008.

When i press the power button the white light shows up then the scheme and then all i have is a black screen. NO apple logo NO grey screen nothing.

then in a few seconds Windows 7 Loads up.

I tried to insert Mountain lion cd i hear it working but i cant see nothing the screen just wont turn on.

I tried different screens tried different video cards different cables.

I tried replacing Hard drives.

the problem is that WINDOWS 7 boots and works great but i cant install OSX in any way.

please help.

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OS X Lion or OS X Mountain Lion includes a built in set of utilities in the Recovery System. Restart your Mac and hold down the Command key and the R key (Command-R), and keep holding them until the Apple icon appears, indicating that your Mac is starting up. After the Recovery System is finished starting up, you should see a desktop with a OS X menu bar and a "Mac OS X Utilities" application window. Note: If you see a login window or your own desktop and icons, it is possible that you didn't hold Command-R early enough. Restart and try again.

In order to reinstall OS X Lion or OS X Mountain Lion, you will need to be connected to an Ethernet or Wi-Fi network. The Wi-Fi menu item is in the upper-right corner of the screen. Click the icon to display all available Wi-Fi networks. Click your preferred network name and, if needed, enter a username and/or password.

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You stated you can't install OSX but have windows installed. When you installed Windows did you use boot camp to do it? Normally you install OSX and then use boot camp to create the windows partition to install win 7 etc on. If you have multiple partitions you can hold down the alt key during boot up to select which partition you want to boot from.

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