Windows 10 has not started since July 1st. What's going on?

Now I have several PCs and notebooks that all have the same symptom. It looks like this.

I switch on the devices, the screen remains black (let it run for about 10 minutes), then the on / off switch is pressed. And the PC turns off. I.e. For me, that it doesn't crash at all. But that no picture comes with several devices, that is very questionable. And, I can't get to the bios anymore. Can't choose anything (the screen is and remains black). Graphics card is not. The hard drive is also not. I left everything behind. The devices still do not start (screen still remains black). RAM checked -> error still not fixed. Does anyone have any idea what happened there? I haven't found anything up-to-date on the Internet. I have concerns that there will be more devices. If I find anything else, I'll get back to you.

So several devices in your house are no longer working at once?

If the monitors stay black and don't even show the logo of the graphics card and the BIOS / UEFI, that has nothing to do with Windows.

Was there a thunderstorm with you too?

Do the monitors show that no signal cable is connected when you disconnect it?

Thanks for the answer. There was a storm, but not every user. Monitors don't show anything. Go on standby. But just now, 3 devices have the same problem. Hmm. Funny. I haven't had it yet. I'm going to sit down today at noon. And look.