how to disable ship systems?

I just gotten into act 2 and stole the "training freighter" cargo.
I can't disable any of the ships systems.
In the manual it sais i can in the engineerig screen, lighting up the bar with wich i can browse the systems and press fire or enter to disable the selected one. However neither enter, space or mousebutton1(set by me) works nor the other buttons i smashed frantically trying to find the right one
Please help? The game is patched to latest.

Sadly, only a few subsystems of player ships can be deactivated manually -- in most cases, these are systems which you activated manually in the first place.

However, you can shut off some systems just by reducing the power output of your reactor (the line that reads "### MW"). Drop your power far enough and systems will start deactivating all on their own. Things like life support don't make you die when they go offline, either.

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Thanks,

Things like life support don't make you die when they go offline, either.

haha i noticed.