screen only shows windows I can see the reboot or BIOS screen it says no signal until windows boots

Hi @mo_ei - thanks for reaching out, I'm sorry to hear you're having issues seeing the BIOS screen.

It sounds like the connected computer isn't outputting anything over HDMI until Windows finishes booting. This is a common issue on laptops where the BIOS and startup screens are only displayed on the internal monitor by default. You can sometimes change this in your computer's BIOS settings. It might also help to adjust your display settings so that either your TinyPilot device is the primary display or so that you are using mirroring mode.