Macbook wont load

Hi, I was updating my macbook using the automatic software update. It froze as it was updating so I turned it off. It is now refusing to power up, all I get is the grey screen with the whirring circle. I've tried starting it up whilst pressing the 'Option' key and I've tried pressing the command, option, p and r keys whilst starting it up. I've taken the battery out and put it back in again, but nothing seems to be working. My computer is only 10 months old and I've never had any problems with it up til now. My knowledge of these things is minimal to say the least. Please help!!!

Hi,
I would recommend backing up before doing this if possible to be on the safe side.
By the sounds of things the OS is messed up you will need to re-install it. It will not delete any personal files or applications or users or settings. It should only write over the OS files (i noticed my login background had returned back to default as i had changed it) i have done this myself.
To do this
-hold down alt and turn on the computer until the selection of what to boot from
-insert the Snow Leopard install DVD
-select the Snow Leopard install DVD (may take a moment for it to come up in the menu)
(may take a while to load)
-Select language of your preference
-Choose the drive to install to (the drive that had the OS that became messed up) (DO NOT GO into disk utilities and format the drive if you wish to keep the files on the drive)
-Click Continue and it should begin installing
Once the installation has completed and the computer has reset itself. You should be able to login as your user from before.
If an update appears to freeze leave it for a while (maybe about 30min) and come back to see if its still at the same location to be sure its truly frozen before turning it off during an update.
I hope this helps
Regards,
Stephen
Message was edited by: Stephiroth

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