Installing computers

I was in an office with lots of older computers.  There was hardly any room to move around there were so many.  My task was to install some new disk drives.  The disks were big and had lots of big cables coming out of them.  I walked to a stand up tape drive and punched some buttons.  The tape stopped moving and I knew I had done something wrong.  There was a display with red letters that had some computer terms on it that displayed the status of the tapes.   I looked around and somebody pointed at me.  I walked to him and he told me he knew what I had done.  I walk over and started hooking up the disk drives.