Thank you for your message. I sincerely apologize for the inconvenience caused.
Did you have a grey screen out of the box or did it happen after an update?
Please turn off the computer using the power button. Start the computer by tapping F12 & select diagnostics & check if there is an error message.
Please click on my Dell username & send a private message with the Service tag, registered name & email address.
Dell-SreejithRSocial Media Support#IWork4Dell