"Problem exists between chair and keyboard." In other words, the problem is the user. Following are similar "digispeak" acronyms. See
digispeak.
EBCAK
Error between chair & keyboard.
PLBCAK
Problem lies between chair & keyboard.
PICNIC
Problem in chair, not in computer.
PEBKAC
Problem exists between keyboard & chair.
EBKAC
Error between keyboard & chair.
PLBKAC
Problem lies between keyboard & chair.