problem in brand new Apple watch not booting up

Hi jayg146,

Welcome to Apple Support Communities. With the Apple Watch not turning on and displaying a red lightning bolt on the screen, you'll want to keep the Apple Watch charging for up to 30 minutes. You may also need to press the side button to make the watch face appear. Here's additional details:

Find out if your Apple Watch is charging

When you connect your Apple Watch to its charging cable and power, a lightning bolt  should appear on the screen.

If your Apple Watch with watchOS 9 is in Low Power Mode, the icons, time, and day shown below all appear in yellow.

If your watch requires charging, a red lightning bolt  appears on the screen. (You might need to press the side button to make the watch face appear.) When your watch is charging, the red lightning bolt  changes to a green or yellow lightning bolt . If your screen is blank or the charging cable icon and a red lightning bolt  appear on the screen, charge your watch for up to 30 minutes. 

This information is outlined in this helpful article: If your Apple Watch won't charge or it won't turn on - Apple Support

Now if these steps do not help, you'll want to follow the next section within the article that states "Get help if your Apple Watch won't charge." This will help troubleshoot if your Apple Watch cannot be charged.

We look forward to hearing back from you with an update.

Kind regards.