Hi Ethel Holloway,
 
Thank you for reaching out. That definitely sounds concerning that your Google display is not showing anything. I would be more than happy to help. First, I have some questions to get a better understanding of this issue:
  • Which Google device is this occurring on? (Model name, generation number)
  • When it is gray, do you see a G logo in the middle?
  • Could you please attach a photo of your display?
  • Have you tried rebooting or resetting your device?
I look forward to your response. Thanks.