To calculate the overall star rating and percentage breakdown by star, we do not use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
First, there was an error message "Chrome OS is missing or damaged", after which the Chromebook is unable to start up. This is only after 5 months of light usage. I have yet to figure out what else can be done.