EliteBook 6930p does not boot from USB or CD, only SD works

[mssm]

Hello,

I can't get that EliteBook 6930p booting from a linux live distribution on USB or CD. I tried my favourite Live linux

http://www.system-rescue-cd.org/

Current Version: 5.3.2

I run isohybrid on the ISO and write it to an USB stick. I tried 4 Sticks and all of the USB-Ports with no other device connected. It just freezes in the early boot screen and reads on the USB stick forever. I waited 15 minutes. F9 for the boot menu doesn't do anything.

Just with the stick inserted, the device does not boot at all.

The same ISO on a SD card works fine, just there is a bug with booting up that linux from SD failing later without sd support in the kernel...

I tried the same ISO on a CD-R, same like the USB-stick, it reads forever, no boot devices menu.

The installed BIOS is the latest F.20 from 9. Dez. 2011.

I tried enabling all boot options, or disabling all then enabling only a single option like USB. I tried with UEFI enabled and disabled. I also tried a BIOS reset to defaults.

Even if the ISO image on USB isn't valid, it should not freeze on reading.

The same ISO on USB boots fine on a EliteBook 8560w.

Any idea?

[Lil_Boy_Blue]

Hi

https://support.hp.com/us-en/product/hp-elitebook-6930p-notebook-pc/3688868

http://h10032.www1.hp.com/ctg/Manual/c02514991

http://h10032.www1.hp.com/ctg/Manual/c01728320

[mssm]

Thanks. Why did you send me the TXT implementation, do I need that to boot from external devices? I have TXT disabled in the Bios currently.