My macbook pro will only start-up in grey screen

hi, i have a potentially big problem
I have just purchased macbook pro 15 inch 2.0 GHZ and tried to transfer data using the migration assistant.
i started have numerous problems like i did not have permissions to open folders - i found out how to solve that from this forum and it worked
i had more problems though with Teamviewer - it would not open - came up with an error message 600, so i downloaded the newest version which also wouldn't open.
and basically it just got from bad to worse.....
so i thought that i would then try to do a restore from 'My Passport for Mac' external hard drive.
then i got numerous messages popping up saying 'system extensions cannot be used' etc
i tried numerous times to restart new laptop, shutdown or even hard re-boot and it would not
so i went into SYSTEM / LIBRARY / EXTENSION and started deleting the files that it said were not installed properly
the list went on and on and on so i deleted the whole contents of extension folder - it was only then that the laptop would restart
BUT - now that it has restarted i get the restart 'sound' a grey screen with the apple icon in the middle - no cursor and some small writing in the top left hand corner (looks like CMD mode) and amongst the jargon it does say 'unable to find driver for this platform'
what on earth have i done ?
please help
thanks
Serena

i found the answer to my question on this forum - see below, hallelujah.....
This solved my question by Franco16 on Jun 13, 2012 3:13 AM
I found the solution, thanks to MrE_the_Great (read following cut and paste)
I'm glad it worked out. I'll put the steps below again for others who join this discussion late and to clarify as I was typing on a phone last night while my MBP was re-installing.
1) Hold in command-r while rebooting (or from cold start) to boot to the recovery partition.
2) Chose re-install mac osx
3) Enter appleID credentials
4) After the re-install is complete (may take a while depending on your intenet connection etc) all your files, preferences, and software will be there, you shouldn't lose anything.
5) DO NOT reattempt the Thunderbolt update. You can update the iPhoto and other updates that Software Update finds...just DO NOT check the Thunderbolt one or you will be at step one again.
for more information go here https://discussions.apple.com/thread/4020399?start=60&tstart=0

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my macbook pro won't start up past the grey screen, NO MATTER WHAT I DO. i've searched all the discussions on this, and NOTHING WORKS. nothing caused this either - i was just browing the internet and using ichat, and my computer shut down, and that is when this started.
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My macbook pro will only start-up in grey screen

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