MSi GT70 - 0NE-276us Sudden Power Off/Will not Stay On

Question

First and foremost, thank you for taking the time to read about my problem. No sob story, however this is my only computer and it was/is my work machine in the IT Administrative/Deskside Workplace. Any ideas are welcome.
I have an MSi GT70-0NE 276us Laptop. I bought it last year (Christmas). I was playing a game on Steam when suddenly the machine turned off. Using my troubleshooting experience, here is what I tried:
-Removing the battery and power supply from the machine and holding power button for 1 minute
  -After testing with ONLY the battery inside the machine, pressing the power button makes a white flash and a shimmer of light sent to the keyboard, but doesnt actually turn on. It does this upon each keypress and does not skip a beat.
- I tried to connect the power supply directly into the laptop WITHOUT the battery connected, and it does the same thing. As for the battery indicator light, it does not stay on as it normally would when the power is connected to it.
  NOTE: I have NEVER used my laptop WITHOUT the power cord connected; it is always attached since I know its a power hog.
- I have checked for any smells of burning/melting and there are none. The laptop was also not that hot when it cut off suddenly.
- Ive blown the mainboard/underside with compressed air and removed all of the dust
- Ive made sure the fan was clear and connected
- Ive reseated the RAM
- I have NOT tried another power brick; the one I received was refurbished.
- The LED on the power brick lights up but nothing is coming into the machine
- I have not had the laptop 10 months and its always connected to the wall/power outlet
So if it is the motherboard, I wouldnt be too surprised but Ive know MSi to make excellent motherboards, hence the reason I spent 2500.00 on it. A fellow IT friend said I may want to try a new power supply that has the exact specs your laptop needs. As if its possible the load on the end of the power brick that goes into my laptop may be done for.
I removed the Battery and noticed this:
The inside of the laptop after removing the battery say
MS 1762
DC Rating 19V=9.5A
My Battery says (MSi battery)
11.1 Vdc = 7800mAh, 87 Wh
..But the power brick reads
Input 100-240 V ~2A 50-60Hz
Output 19.5 Volts =7.7 A
He suggested trying a new power suppy but Im concerned its the motherboard (because us IT Guys know the motherboard will get you everytime)
So is it possible? Im not sure why they may have given me the wrong power brick, if it is wrong. He says the specs dont add up, and since each time I press the button and the white light flickers and part of the keyboard, he said it may be the power bricks' node that connects to my machine. Im used to motherboards that are done for the machine shows no sighns, no hints, no flickers. This is atleast flickering, just not coming on .
I know its alot to read and I appreciate all of the techs/other users time.

Answer 1

Thanks guys. Your input is not falling on deaf ears and it seems im getting reputable support via the forums with the MSi tech team.
It really is so weird. Today I tried the process of elimination from a video I saw on you tube. Now, keep in mind, each time the power button is pressed with either their power brick/battery alone in the machine, the power light and the 'battery' indicator light at the front of the machine flicker (each keypress; even if you do it rapidly).
I took the bottom tray off and checked the fan and blew it out with compressed air. Checked the thermal paste under the processor heatsink, checked the processor condition and all looks well there.
Tested by removing one connection at a time then testing for power (all along while testing, keep in mind I only have the 19.5v 7.7 amp power brick.)
- removed D:/ drive secondary  then checked for continuity; no luck
- removed all 4 ram sticks and tested one at a time with the power supply connected; no continuity
- removed the keyboard ribbon cable and tested; still no luck
- removed (what I believe to be) the usb ribbon cable (hub with 3.0 ports) and tested for any indicator lights; still no luck
- unplugged the cmos for 5 mins and reconnected; still no luck
*NOTE: when I look underneath of the laptop when pressing the power button, the fan that has the gpu and the cpu heatsinks up against, it actually spins for a brief second; about as long as the power button flashes.
I stopped at some stores looking for a 180+ watt adapter and i couldnt find one that carried it. I wanted to test it before purchasing, so Ive avoided online purchase up to this point. However, I do realize I need one anyway at this point regardless.
My buddy has his own PC Repair shop. He doesnt have a power brick of that magnitude, but cant we get a voltmeter and check for continuity from not only the power supply, but also the jack soldered on the motherboard?
He is saying kinda what Dark is saying... Me, I think its a short somewhere... he thinks the computer asked for too much power from the power supply and probably burnt out the tip because at the time it cut off, I was playing a graphic intensive game, and in my USB 3.0 ports on a single hub, I had the following connected:
- A Logitech USB headset (wired)
- an XBOX 360 wired controller
- A Logitech G700 gaming mouse charging
Ive never had that many power hungry devices connected to one hub at one time before.