Macbook Pro 2010 OS X ML Won't Reinstall - Now Mac Stuck on Grey Screen

Two days ago I restarted my computer and it was stuck on the grey screen. I was able to enter safe mode and decided to reinstall OS X ML. It downloaded, and when it went to reinstall, I get an error. Tried several times, no luck. So I made a boot disk on a USB key, still no luck. "There was a problem installing 'Mac OS X'. Try reinstalling."
Now I cannot even enter safe mode. When I hold down the shift key, the apple icon scrolls through multiple icons. When I let go, the computer freezes.
I've checked the disk on Disk Utility and it says it's OK.
I have a disk copy of Snow Leopard, should I try reinstalling that and then upgrading to ML after?
MBP 2010 i7 2.66
Thanks!
Owen

Holding the shutdown buttom down for several seconds solved the problem. When I booted my mac again, it continued with the update. However, do you guys think my mac have taken damage of this?

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Reinstall OS X.
Reinstall Snow Leopard without erasing the drive
1. Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
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If the drive is OK then quit DU and return to the installer. Proceed with reinstalling OS X. Note that the Snow Leopard installer will not erase your drive or disturb your files. After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install Mac OS X 10.6.8 Update Combo v1.1.
====================================
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Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
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Reinstall Mountain Lion or Mavericks
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Hi there,
I recently got my MBP Mid-2010 with a Core i5, 4GB RAM and the BTO 500GB 7200rpm HDD.
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A friend of mine has ordered the same configuration as I have at the same time. She hasn't experienced any problems so far. She's going to pay close attention to her MacBook tomorrow when she boots it in the morning. And in a couple of days we're going to test them side by side. I'll keep you posted.
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Macbook Pro 2010 OS X ML Won't Reinstall - Now Mac Stuck on Grey Screen

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