My macbook pro just turned off on me twice! What could this be?

Every morning I wake up and charge my macbook. Today I turned it on, and instantly put my ipod to charge off the laptop before it even booted up. (never really dont that before) Well after it turned on it was fine, but it just shut off on me. So I disconnected the ipod, and turned it back on. This time I waited til it booted up and then i put my ipod to charge. I notice that iTunes didnt open up automatically. Continued onto the internet. As I was browsing it shut off on me a second time. Anyone have an idea as to why it just randomly shut off on me? Please advise. I am really nervous about this computer for the simple fact it costed me alot of money, and I was not able to afford AppleCare. Please let me kno if you may have an idea as to why it shut off on my on its own... Thank you in advance

Can you hear the fans spinning up? At normal idle (2000 rpm on my Mid 2012 non-Retina 13-inch MBP) they are not audible except in a very quite room. They have to get to about 2500 rpm for a person with normal hearing to notice them running in a typical office or home environment.
Will the computer start if you hold the SHIFT key during boot? That takes longer because it does some directory checks, so keep holding SHIFT until you see a message that you are in Safe Mode or you get a stable desktop.
To further test, we need to know your exact MBP variant. If the computer will not start, you can enter your serial number into this Apple Support page:
https://selfsolve.apple.com/agreementWarrantyDynamic.do
That will give you the exact model info.
On pre-Unibody MBPs (Early 2008 and older, the serial number is under the detachable battery. On later models it is on the case bottom in fine type (a magnifier helps).
Once we know your exact model we can offer a reset procedure, or at least tell you how to run Apple Hardware Test to check for hardware issues.

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