>>>>> On Wed, 29 Mar 2017 14:51:54 +0300, Николич Роберт <rob-...@yandex.ru> 
>>>>> said:

    > Ive decided to try FAI for the first time (im relatively new to Linux)
    > I downloaded stretch-faicd64-small_5.3.4.iso image from site and i wrote 
this image to flash drive (with dd, as described)
    > However, im unable to boot from this flash drive. Why? Im i doing 
something wrong? How to fix it?
    > For comparison, everything goes as expected when i write normal debian 
iso to same device - im able to boot from it and successfully perform 
installation.
Does this computer has UEFI? Or is it more an old PC? Some BIOS have
different options how to boot from USB stick. There's SUB floppy, USB
hd and some other options which type of USB stick a BIOS can
boot. Maybe try the USB stick on another computer to see if it's
working correctly.

-- 
regards Thomas

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