power adapter wont help as long as there are no bolts on the screen
the mouse does work, so id try a different keyboard
from time to time some forum users reported that certain keyboards interfere with mice and make the whole setup unplayable
next time you come from work take the keyboard with you and test it at home with the xim3
or ask the neighbour, pretty much any keyboard will do it
btw the adapter has to work, its the correct one