Okay, so the problem I have with the laptop is related to the power port being used on the left side of Chromebook. If right hand power port used, no problem. If I plug in to the left side, Chromebook immediately switches off. This is followed by the intermittent revving up of the fan in an off/on rhythm as if it is trying and constantly failing to restart. Plug it in to the right hand port and it all restarts and runs fine. On restart it reports an unexpected shutdown and asks do I want to restore previous page view. Suppose I should bung blue-tack in left port as something obviously wrong there. What has gone wrong?