MBP turns off Randomly Without Warning

"For reference from the other Q:

It sounds like you may have multiple problems here:

First lets reset the SMC logic so the level of charge the battery has is correct Intel-based Macs: Resetting the System Management Controller (SMC).I would download this little gem to better monitor the battery coconutBattery 2.8.I would also download a good temp & fan monitoring app like Temperature Gauge Pro. While there are others this one is the best one I have found.

Now with the better diagnostic software running what is it telling you? Is the battery worn out? Is the charging circuit having problems? Is the temp running high and the fans not working?

Given the age of your system you may need to clean & reapply thermal paste on the CPU & GPU chips heat sink and clean out the dust buildup thats in the system. But for now lets see what the new tools are telling us.

Snap a few screen captures and post them here so we can see whats up."

"I cannot say for sure since I don't have it on my bench to test and confirm, but I think your laptop is suffering from one of the following:

- Intermittent backlight unless you are sure the laptop is definitely shutting off completely, not just switching off the light of the screen (flash a light behind the Apple and see if something appears on the screen).

- Intermittent shut off from overheating, needs cleaning and/or new CPU heat compound and/or new heat sink and/or new fan.

- Intermittent power failure due to a board level issue: failure of some component that intake power from main power rail and produce secondary yet critical power rails.

- Intermittent GPU failure in which case it is better to have it replaced as the cost may exceed the cost of a new/used board."

After getting to the point where my MacBook Pro won't stay powered on for more than a few minutes at a time, I finally broke down and went to the Apple Store. After 6 months of progressively worse and random shutdowns, thousands of dollars in lost time and revenue, and abject, utter frustration . The Genius Bar "guru" ran a bunch of tests, and of course, my computer passed all with flying colors. They told me to leave it and they'd open it up to diagnose further. Finally they told me that one of the screws that holds the heat sink in place has snapped and I need to replace the motherboard! A brand new motherboard when the computer is less than 3 years old and in mint condition? I was floored. I paid almost 2k for this computer, and now have to pay another $600 to fix an obviously faulty part?! I'm beyond livid at Apple and it's BS.