Password required to start LinuxCNC from USB stick

Hello,
I have just created a bootable USB stick from the LinuxCNC 2.7.14 Wheezy. iso file and when starting the computer from the USB stick it asks at once for a password.
Which is that password?
Kind regards
Aloha

Does it ask for the password before attempting to boot or after having booted.
It could be that there is a BIOS password that is needed when booting from media other than the HDD or SSD.
Can you boot other OSs from a USB stick ?
Is the machine an ex corporate machine ?

In noticed this when testing - but forgot to mention.
While runing live, if you wait too long doing nothing, a password is required to regain the desktop again.
I never did find out what the password was.

Yes, I have checked the md5sum and it did match.
After trying a live system with weezy, I have tried with linuxcnc 2.8.0 buster: the same problem.
When I start the computer I press F8 to access the BIOS in order to choose the USB stick to boot from, but it asks at once for a password.
Same problem with a live MX system.
So, it seems indeed to be the BIOS that asks for a password, but I am not aware having fixed one.

I have bought the computer new in a store some 5 years ago.

I have then tried with an other computer, that doesn't ask for a password, I may choose the USB stick to boot from, but there is only a prompt in the upper left corner.

I have installed both linuxcnc systems with LinuxLive USB Creator from a Win 10 computer. When I chose the source file I was told that this Linux system is not in the compatibility list but that the tool would nevertheless try to install it and after the installation I was told that it was installed successfully.

Win32diskimager reads only .img files, but I have 2 .iso files.

No it reads ISO files, I've used it for years. It works and works perfectly every time I've used it.
If it didn't read ISO files no one would recommend it for writing an ISO file to a USB stick.

Have you choosen to look for iso?

Hello,
Mine doesn't recognize .iso files and I don't see any option in the tool to change that.