MacBook Pro won't boot and shut down on its own.

Hi, I am running a Macbook Pro. My problem is that the OS froze during use, and I could not move the cursor. As which point I force shut down by holding the powerswitch. From that point onwards I could not get the machine to boot, it keep getting stuck at the grey screen with Apple icon. After loading at the grey screen for 15-20 mins it shuts down on its own.
I've tried to reset SMC (shift-control-option + power button) and PRAM (Command-Option-P-R) but it dint work. Please help. Thanks.

It appears your problem occured after you upgraded to 10.8.2, but if you did it right after the SSD and RAM switch then it's hard to tell exactly what is causing the issue.
I advise returning back to factory, hold command option r boot and wipe everything and reinstall 10.8
..Step by Step to fix your Mac
If the problem continues, then make a warranty/AppleCare call, hopefully you didn't strip the screw heads or leave any other tell tale damage inside.
If your fine on 10.8.2 for some time, then switch the RAM and do a hardware test extended or Rember or Memtest to make sure the new RAM is not the issue.
If that's fine then Carbon Copy Cloner to the external SSD and hold option key down to boot from it and test that.
Then do the internal SSD switch and test that.
Take your time, Mac's are so finicky and you can't just slap this or that and expect it all to immediatly work like it should.

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