Linux does not boot from the usb stick?

I have a full Linux installed on a usb stick. On the laptop synonymous everything fits, but the standpc I get only a black screen with a blank the whole time is flashing. I tried to install the stand pc grub, but it does not work either. Any ideas?

Can the desktop be booted from the USB stick at all?

And if so, have you set the boot order in the BIOS accordingly?

Maybe incompatible.

First of all, you do not have Linux installed, you have an operating system with a Linux kernel.
Which operating system, better known as Linux distribution, do you have.
Do laptop and PC have the same processor architecture?
One device may be a 32-bit, the other a 64-bit computer.
That will not work. (Although I'm not sure if a 32-bit code does not run on a 64-bit.)

Both 64bit, yes on the stand pc created the stick which confuses me in addition that he does not work then

I understand correctly, you have a Linux operating system on the PC on the stick installed. Not immediately tried, if that was successful?

It sometimes fails to explain why a PC does not boot from a USB knot over the path "Select Boot Device in BIOS". About the BIOS boot menu (with with after switching on with F8 achievable) then but nevertheless.
Why did you do that? No idea, no explanation.

Maybe you try it that way.

Tried already, has worked first, then connected to the laptop also works, now tried again on the pc now nothing works, only on the laptop

That's hard to verify. In the background, data for the bootloader grub2 might have been changed in the laptop.
I had such a case that the UUID of a partition did not match the entries.
That actually leads to such behavior.
On the laptop you did not run any updates?