HP ProBook 5320m can't boot openSUSE 12.1 x86_64 iso from USB stick

I’m trying to upgrade from 11.4 to 12.1 but the BIOS doesn’t recognize the USB stick correctly. The effect looks like this: The stick blinks slowly, then the stick glows and then it starts to blink rapidly. At that stage, the laptop sometime freezes.

I tried:

No game. I can copy the image to the laptop. Is there a way to install from an ISO image on harddisk when all you have is GRUB? Or can I maybe start the install from Windows (without a CD or an USB stick)?