Mac HD greyed out in Disk Utility

Hey,
This all started after Mountain Lion, which slowed down my MacBook a lot. I tried to do a clean install and reformat my HD, and doing so it removed the partition already on it. When I went to restore the HD, every option is greyed out except for Verify and Repair Disk (which I have clicked on numerous times to no avail). I cannot even add a partition to the Hard Drive. This Hard Drive worked fine until I clicked erase (in which it gave me an error), and I just want to create another partition (which is also greyed out).
I don't care if everything gets erased, frankly I just want my Mac back to normal. I do have a Mountain Lion USB, but that does squat. Thank you Mountain Lion by the way for this long day in which my Mac still isn't fixed.
Any help is appreciated, I am new to Mac, just moved from PC which looks pretty good right about now.

While we all have MacBooks in this forum most of us don’t run Mountain Lion. There's a Mountain Lion Support Community where everybody has Mountain Lion. You should also post this question there to increase your chances of getting an answer. https://discussions.apple.com/community/mac_os/os_x_mountain_lion

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Here's a screenshot.
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You've got other problems in addition to the Erase being grayed out.
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Mac Book Pro -
My MacBook Pro (2008 Model) has been unable to start up - upon the start up screen when the grey Apple logo appears, I get a loading bar below it.
After about 15-20 minutes when the bar is almost complete the machine shuts off. There seems to be no way around it.
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I would take out the HDD and install it in an enclosure and then connect that to the Mac Pro and see if there is any success.
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Hey,
This all started after Mountain Lion, which slowed down my MacBook a lot. I tried to do a clean install and reformat my HD, and doing so it removed the partition already on it. When I went to restore the HD, every option is greyed out except for Verify and Repair Disk (which I have clicked on numerous times to no avail). I cannot even add a partition to the Hard Drive. This Hard Drive worked fine until I clicked erase (in which it gave me an error), and I just want to create another partition (which is also greyed out).
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Old
look my 0 partition. It is the internal. The 2 is my drive.
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Notice that stars beside the 750?
Everything work great. I just can't add a partition.
Can't resize?
Am I booting from EFI?
/dev/disk0
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   1:                        EFI                         209.7 MB   disk0s1
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Hi again and thanks for bearing with me!
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Mac HD greyed out in Disk Utility

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