Hi Meg_n 👋 Thank you for your post and welcome to the Virgin Media Community 😀
We're sorry to hear about the problem you're having 😔
If it's a Hub 3, please follow the below steps in the following order:
• Turn the power switch off on the back of the Hub
• Ensure the Hub is upright, in a well-ventilated location, and, if at all possible, out of direct sunlight
• Use the power switch to turn the unit back on
If after following the steps the router doesn't boot back up after a few minutes, or the red light returns when it does, it'll need replacing.
Please pop back to us at your earliest convenience.
Thank you for your support Tudor 👍
Regards,
Daniel