Hi Dan,
Welcome to Microsoft Community.
I'm sorry to hear about the trouble you're experiencing with your Surface Laptop 4. Here are a few steps you can try to resolve the issue:
- If recharging your Surface didn’t wake it up:
- Connect to a keyboard or use an integrated keyboard.
- Press the Windows logo key + Ctrl + Shift + B.
- Press and hold the power button until the logo screen appears (about 20 seconds). See Force a shutdown and restart your Surface - Microsoft Support for more info.
If your Surface doesn't turn on at all, your device needs to be sent to Microsoft for repair or replacement. For more details, check How to get service or repair for Surface - Microsoft Support.
I hope one of these steps helps get your Surface Laptop 4 back up and running!
Your Sincerely
Hahn. W - MSFT | Microsoft Community Support Specialist