Recently bought a new WD Elements 4tb USB 3 external HDD and, whilst I can connect to my Probook 4540s AFTER booting into Windows, if I leave it attached when I power down then next time I power on the PC hangs at the 'hit esc for bios' message.
I've checked all BIOS sttings and made sure that only internal HDD and DVD Drive are checked as bootable but just can't get the thing to boot if this USB HDD is attached.