My MacBook Pro(early 2011) not turning on

Question

I've had this mac for 5 months already, hasn't given me a problem until now. It was working fine when I used it this morning. I left it plugged in and went to work. So when I came back from work, I tried to turn it on but it doesn't. Every time I press the power button, I can hear the hard drive trying to turn on but it turns off immediately. It indicates that the battery is full but it doesn't turn on. I recently upgraded the ram from 4gb to 8gb about 2 months ago.
Is it a hard drive failure? Ram? or should I give it some time and then try again? Or take it to an Apple Store?
Thanks
I made a video so you can understand it better.
http://www.youtube.com/watch?v=9aoAn5snl2U

Answer 1

could try this::
Resetting the SMC on portables with a battery you should not remove on your own
Note: Portable computers that have a battery you should not remove on your own include MacBook Pro (Early 2009) and later, all models of MacBook Air, and MacBook (Late 2009).
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer. 
Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.
The System Management Controller (SMC) is responsible for many low-level functions on Intel-based Macs. These functions include:
Responding to presses of the power button
Responding to display lid opening and closing on portable Macs
Battery management
Thermal management
The SMS (Sudden Motion Sensor)
Ambient light sensing
Keyboard backlighting
Status Indicator Light (SIL) management
Battery status indicator lights
Selecting an external (instead of internal) video source for some iMac displays