Unless you want a nasty shock, you should look for something to help with the cable.
Try some places that deal with hazardous substances.
Firstly, a glove - secondly, something that would protect it against electricity.
In a location where touching things with bare hands is a bad idea.
The botany lab has an out-of-place-looking oven glove that could prove useful.
There are several materials that don't conduct electricity - rubber, for example.
Rubber is often used in construction. ?
You passed something full of rubber earlier, too.
The construction site! On the far right, an industrial mixer is full of liquid rubber.
Dipping the oven mitt inside will insulate it nicely.
We have the protection we needed - return to the computer and switch it off!
Don't forget to switch it back on again, though. We still need authorisation, after all.
It's a shame computers are immune to bullying - that would've been a LOT easier.
Next up - the train key.