this issue seems slightly different from the many auto-boot discussions ive found searching the support forums.

Using version 6.12.24-Unraid x86_64, with UEFI

The machine has dedicated pool drives, and also has one drive outside the pool that I occasionally use to boot the machine into windows (this was there before deciding to set up Unraid).

When powering on, the machine does automatically start the unraid syslinux bootloader menu, and shows the automatic boot countdown, and "Unraid OS" is the default highlighted, (as i expect from "menu default" in the config) but after the countdown it then boots to the (windows) bootable disk, instead of the Unraid OS option. If I am watching, i can press the enter key on the default "Unraid OS" option and it will boot into Unraid just fine. But, if I do nothing, it will boot to Windows instead.

So, up to now, every time the machine is rebooted it needs a monitor and keyboard attached to it to manually supervise the boot. Looking at the config, the default is to open this menu, and menu default selects the "Unraid OS" option (i want this to be the default). I think everything in this config is correct, so i am a little lost. Can someone help me with this configuration file?

Server boot mode is set to UEFI, with Permit UEFI boot mode checked, and My syslinux config is:

default menu.c32
menu title Lime Technology, Inc.
prompt 0
timeout 50
label Unraid OS
  menu default
  kernel /bzimage
  append initrd=/bzroot
label Unraid OS GUI Mode
  kernel /bzimage
  append initrd=/bzroot,/bzroot-gui
label Unraid OS Safe Mode (no plugins, no GUI)
  kernel /bzimage
  append initrd=/bzroot unraidsafemode
label Unraid OS GUI Safe Mode (no plugins)
  kernel /bzimage
  append initrd=/bzroot,/bzroot-gui unraidsafemode
label Memtest86+
  kernel /memtest

Edited August 11, 2025Aug 11 by quopas
Clarifying my question

10 minutes ago, quopas said:

If I am watching, i can press the "enter" key on the "Unraid OS" option and it will boot just fine.

Do you mean you just select the default option?

9 hours ago, JorgeB said:

Do you mean you just select the default option?

Ah yes, I mean I press enter on the default and it boots up Unraid.

If I don't touch anything it then boots into windows.

I'll edit my original post to clarify

Edited August 11, 2025Aug 11 by quopas
Fixing typos

This doesn't make much sense; please try with a new flash drive using a stock Unraid install, no key needed, just to rule out any weird config issue.