I had my A1260 MacBook Pro open to install an SSD.
That went beautifully. Re-installed the OS and got it up and going, fast and beautiful.
Filled with confidence, I decided to check out then oisy fan that had been making noise. Took the fan apart, cleaned it, greased it, replaced it. Booted fine.
Before I closed and screwed-in the case completely, I noticed that one of the screw heads was loose so I disconnected the keyboard again, moved it out of the way, and tightened the screw.
I plugged the keyboard back in and tried to turn it on to check. The fans went FULL SPEED NUTS and a real bad smell came from the back end of the open machine. I turned it off very hurriedly.
It was only after cleaning out my pants that I noticed that I had plugged the keyboard in upside down. I turned it around, plugged it in the right way, and now all I get is a slight twitch off the left fan when I try to start it.
I killed my MacBook Pro by plugging the keyboard in upside down. What the hell?