Booting fails in about 60% of the cases, can't find root device

Hi guys,
when I boot Arch Linux, it boots fine in some cases, and then in other cases it doesn't. The kernel messages are always the same (note also the times in seconds):
Do not use full size images. Use an image hosting site. --- Inxsible
He doesn't find /dev/sda1, which is my root partition. I use UUIDs in my /etc/fstab, I'm not sure if that plays a role.
Those 30-second-waiting-periods shown in the image do not occur when he boots fine.
Does anyone know where I can begin searching for the error? I don't even know if it's a software or hardware issue.
Last edited by Inxsible (2012-11-08 20:01:29)

dontbugme wrote:
Tried to boot latest Arch iso, it can't mount /dev/disk/by-label/ARCH...:
Waiting 30 seconds for device /dev/disk/by-label/ARCH...
In /dev I have sda but no sda1, sda2 etc.
You say this in your other thread. The same happens for me. The iso on a USB stick can't mount itself and the boot procedure just hangs there. Other isos on the same USB stick (I tried Ubuntu) boot fine.

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Grtz

to answer both questions:
menu.lst:
root (hd0,1)
kernel /boot/vmlinuz26 root=/dev/sda2 vga=795 ro
initrd /boot/kernel26.img
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