System shuts down randomly. Have tried reset SMC/NVRAM and a lot more

Thank you very much Dan! for your input, I have been sifting through so many log files in the console now and I could never pinpoint the shutdown causes or if there was any indication of malfunctioning hardware. Finally I tried systematically to remove extensions, one by one and finally at some point (I had aparantly then removed some extensions that control the light level on the screen (I am not able to turn down the light but for me it is a small price to pay for a working machine - another extension, that I presume runs the camera, was also turned off, so no camera :-( albeit I would rather have funcioning machine (and it really does run nicely :-) ) than having to pay for a new MLB. Again thank you very much for your input and thank you to this forum, for being so excellent :-)

This reminds me of the game Jenga.

I wish you hadn't done that as I'm not sure you are dealing with a software driver issue. If you were I would have recommended backing up the drive, then wiping it clean and installing a fresh OS.

I still think your approach is too extreme a process as you're expecting the last thing you pull will be the bad software. Then what??

How about rebooting your system resetting everything back, clear the log files as I only need one, then let it crash once more! Then paste the log file here for us to review. While I can't promise I'll catch the problem, I'm sure it won't take as long as your approach.

Hi Dan :-) sorry for the late response, maybe I didn´t mention this but I allready tried fresh install several times and even to an external drive. I even booted the machine via taget mode from others machines, also woth noting is that during the install, once the OSX is installed and the machine (presumably) boots WITH extensions, to finish the installation (creating a user and so on) the problem allready occurs. So foregive my boldness/arrogance but I am quite certain that it is malfunctioning hardware and my only option (couldn´t afford MLB replacement) seemed to be to "disable" the hardware that was malfunctioning by removing extensions - machine has been running perfectly since then (albeit I can´t use the control for brightness of the screeen and the camera but that seems a tradeoff I am willing to endure).

I'm still looking for that log file ;-}

OK I get it! You thought pulling the driver/s would stabilize your system by deactivating the hardware which has failed (in your eyes).

But, you haven't really ID'ed the failing hardware and it could be a minor issue! A clean log file should help us ID the bad boy! Or you could try the built-in diagnostics.

Having something to work off will help us help you! We still need a bit of background as well did you bang the system or get it wet some how?