Random crashes

Hi there. I don't know whether this should be in Mac OS X or in here, but I've just posted it here in the end.

I've been getting this 4 times in a row and now my concern is growing. I have an MBP as per my signature. Twice yesterday and twice today, my machine has just stopped responding. There is no spinning beach ball, there is no indication or warning whatsoever. It just stops working. Even the mouse stops. I haven't used it as a laptop for the past 3 days, so I don't know whether or not it only happens when I'm using it in clamshell mode (which I was, all 4 times)

Now what I have had running common to all 4 incidents are iTunes playing a song, Safari (1 window, containing 7/8 tabs) MSN Messenger. Earlier on I had Preview open and also Transmission, but that wasn't on in the first three times. Now I don't exactly remember what triggered it in the previous times, but earlier on I just used cmd-W to close a tab in Safari, and my whole system crashed. iTunes began looping the last 0.5 seconds of music over and over. There seemed to be nothing I could do except force shutdown.

Anyone?

 

No one?

 

Actually I live in Singapore where there aren't Apple Stores around (only resellers). Also, I have never touched the RAM. I got 4GB as standard and it still is 4GB This has never happened to me in the past and if it were because of RAM now I would expect it to have happened to me in the past as well.

I'm just running in clamshell, connected to a display, audio is going out from the line out port to my speakers, then I have an Apple Keyboard and a Logitech mouse plugged in to it. Oh, and ethernet too. That's it