There is no Macintosh HD and Recovery HD on Startup Manager

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You erased Mac OS X when you installed Windows on the computer. Press Command and R keys on boot, open Disk Utility, erase the disk and install OS X

If your computer came with DVDs:

1. Insert the OS X DVD and press C key when your Mac starts.

2. Go to Utilities > Disk Utility and erase the drive.

3. Install OS X again. Then, open  > Software Update and install the most recent version. Finally, open App Store > Purchases and download OS X Mountain Lion

HadiW wrote:

Thanks for reply

But, before you replied. I tried using the PRAM Reset, I think that will fix it. But instead make a new problem.

I can't open the Startup Manager and I have been pressing the Command + R and it's not working

It's keep booting from Windows everytime i turn on the machine

Reboot, when you hear the chime press and hold the X key.

I think you borked OSX when you installed W7, post back if X does not get you to your Mac partition.

mende1 wrote:

If your computer came with DVDs:

1. Insert the OS X DVD and press C key when your Mac starts.

2. Go to Utilities > Disk Utility and erase the drive.

3. Install OS X again. Then, open  > Software Update and install the most recent version. Finally, open App Store > Purchases and download OS X Mountain Lion

The OP is on 10.8, there are no discs, but there should be a recovery partition.

But the OP can't access to Recovery HD, so the OP has to insert the Mac OS X DVD that came with her/his Mac or press Command, Option and R keys if her/his Mac didn't come with DVDs

mende1 wrote:

But the OP can't access to Recovery HD, so the OP has to insert the Mac OS X DVD that came with her/his Mac or press Command, Option and R keys if her/his Mac didn't come with DVDs

That's why I need to know what happens when an OSX boot is forced with the X key, if it doesn't work then there is almost certainly no OSX partition available, I'll wait and see what transpires before I advise what to do next. 🙂

Yes, I think you destroyed your OSX partition when you installed Windows.

Boot to the recovery partition, (hold command-r when your hear the chime) and reinstall OSX. You will need to re-install Boot Camp and Windows.

If you can't start Internet Recovery, press Command, Option and R keys while your Mac is starting, erase the disk and install Lion. Then, open App Store > Purchases and download Mountain Lion

Press Command, Option and R

Then follow mende1's instructions for Internet Recovery.

Don't try it. Windows is starting on an hybrid GPT/MBR partition map and it could break the GUID partition table used in Mac OS X. Take the Mac to an Apple Store