Hi Winkler,
Thank you for posting i am here to help you today. Possible reason you are getting this problem is due to corrupted system files, firmware updates or malware.
May i know if you have other devices connected to your Surface Go 4?.
For the meantime try this steps see it Surface Go 4 will boot now:
Disconnect any external devices or accessories that are connected to your Surface Go 4.
Restart your Surface
Press and hold down the power button until your Surface shuts down and restarts and you see the Windows logo screen (about 20 seconds), then release the power button. After restart check again if Surface Go still not booting up.
Let me know how this goes. Looking forward to helping you out. If you need more help please feel free to let me know.
Best regards,
Jansher