Mac book pro early 2011 won't boot my mac book pro 2011 started having weird instances where it would just cut off and shut down immediately. Then when I tried powering it on, the indicator light would light up for 1 or 2 seconds before completely cutting off as if it were a power failure. 

Sometimes I managed to boot it up again after waitint for awhile and I managed to do an aht test on it, revealing no problems with memory or the logic board. 

What could be causing all this? 

Edit: sometimes I get about 5 minutes of usage before it shuts down completely again. 

Here's a video of how my mac is trying to boot up.  https://youtu.be/wNEMUeyYfxY
The repairman said that it's a logic board failure. I sent it for repair and am currently waiting for news on what could be the cause. Anyway its gonna cost $350 sgd for the repairs.