DAN! Okay I found out what the problem is, you're going to want to make a note of this as it will be helpful to others. Firstly, I stumbled across this which provided clues https://discussions.apple.com/thread/787... It's the firmware that is the issue! I noticed both the 17" models that wouldn't power on my interface had the same firmware as I posted in the screenshot! Firmware Version: d.0, Port Micro Firmware Version: 1.2.1 Unfortunately the correct firmware cannot be installed from any of the later versions of OS X (not sure from when, but presuming Yosemite?) so after a late night and a lot of mucking around I managed to get Mountain Lion 10.8.5 installed onto a spare toshiba drive I had, for some reason I couldn't install from an external caddy either so had to mount the drive internally. I also ran into an an error regarding installing from usb "There was a problem installing “Mac OS X”. Try Reinstalling". Considering how much time it took me I'm very relieved that my hunch was correct! I downloaded...
Hey there, have you tried this? 1) Plug in headphones or external speakers into the line-out jack 2) Shut down the computer 3) Perform an SMC with the speakers still plugged into the jack 4) Boot up 5) Disconnect speakers
Honestly it's worth opening up and checking for anything obvious like a broken battery connection.. Especially if you don't have warranty, even then, if no one can tell you've opened it then whatever! :) Thats what I'd do.
It's not normal.. I'm not to clued up about hondas, but in general with most new cars that have an ECU the first thing I always try is to disconnect the battery for 10 mins then reconnect it. This resets the ECU and any sensors that may be false reading which can cause Idle issues. Of course if the sensors pick something up again the problem will come back, and generally your engine light will stay lit in the instrument cluster.. worth a try!
Sounds like the display issue may be caused by the graphics processor, all 15 & 17" 2011 macbook pros have been recalled for that reason. It's possible you can have it fixed free of charge if it's a 2011 model. See here https://www.apple.com/au/support/macbook...-videoissues/
It doesn't look like corrosion to me, more likely it's some kind of glue or something.. Either way it's not looking too healthy in that state, is it still working? If you have a multimeter there you could give it a test.