Booting Linux fails: Operator System not found?

I'm trying to boot an old laptop with linux (USB stick).

Mainboard: fujitsu siemens amilo l7320
Ram: 1GB
CPU: 1.70 Ghz
Hard disk connection: IDE
On the hard drive: windows xp
BootStick creation program: Rufus
Systems tried to boot: https://cdimage.debian.org/cdimage/archive/9.13.0/amd64/iso-cd/debian-9.13.0-amd64-netinst.iso, http://downloads.sourceforge.net/linuxmintdeutsch/linuxmint-18.3-cinnamon-32bit-de-20171126.iso

I've tried a lot, but no success…

Does somebody has any idea?

Boot stick booted via USB?

Then you did something wrong with Rufus.

also your processor

Intel Celeron M 380

only understands 32bit, the debian amd64 will not work.

Btw you should maybe use an old version of linux, because your box is really very old.

See if you have a legacy only BIOS or a UEFI BIOS. Depending on the situation, the USB stick may not be found. For example, if the USB stick is formatted for UEFI, it may not be recognized as an operating system by an old legacy BIOS. "Operating System not found" Or your UEFI BIOS has disabled boot of legacy devices. Otherwise, try setting the USB stick as 1 boot device in the BIOS, if it is recognized at all. Depending on how old the BIOS is, it doesn't support USB sticks at all. (Seems to be very old the laptop) And the last option would be that the USB stick is created incorrectly.

Linux Bodhi would run this ancient part.

I've finally found the problem, you can't select the devices directly to start, but really had to set boot piracy…