Weird Start-Up Problem

I have 7 months old MacBook.
It does not start up anymore. I don't usually turn it off, but today i had to take it to work. so i shut it down, used it at work, and shut it down again, came home and it didnot start up again. i went thru the usual list: safe mode. wiothout battery boot, bootfrom disk, resetting the ram etc.
but the weird thing is, grey screen show up with apple logo, after 2-3 minutes the computer just turns off. seems like a HW issue but, i havent done anything to it - no accident nothing, i just dont understand what could have caused that problem.
any help is mush appreciated.
(yes, i menaged to make an appointment with geniuses in 3 days! it is a big city and they are all booked up!)

Ok first try these, I realize that you said you tried RAM reset but I believe you meant PRAM. In any case try these as you have nothing to loose right?
1. Reset PRAM:
http://support.apple.com/kb/HT1379
2. Reset SMC:
http://support.apple.com/kb/HT1411
3. Not sure what you did when you booted safemode or DVD but here is what you need to do.
a. Put the install dvd that came with that into the DVD drive, then power-off.
b. Power-on Mac and immediately press and hold the "C-key" until you get to the choose language screen, then select your language and continue.
c. The next will be the Welcome Screen, Go to the top tool bar and select Utilities, then select Disk Utilities.
d. In Disk Utilities select your drive (should say Macintosh HD) from the left window.
e. In the right window select First Aid if not already selected. In the first Aid window towards the bottom you will see a button to "Repair Disk" press that button to run it. If it finishes with errors run again until it no longer has errors. Then run "Repair Disk Permissions", located on the bottom left.
f. While you are in the First Aid window verify the S.M.A.R.T. status, located in the bottom window it should read "Verified".
Once you are complete then just quit Disk Utilities and reboot the Mac.

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