The screen on the Hoist room main computer went blank. The Hoist-man called the electrician right away. We put new cable on the hoist and the electrician checked the limit switches at the collar the Hoist-man moved the skip to the limit switch and re-booted the computer in the hoist-room and this solved our issue.The Hoist went down at 10:40 P.M. and back up at 11:37 P.M.