First boot at install does not work, EFI problem on HP Pavolion?

Trying to intsall openSUSE 13.1 on a new HP Pavilion 500-301nd.

Switched off Secure boot in the BIOS.

Added nomodeset to the bootstring else installation hangs after: Detecting Linux console ....

Wiped the Windows partitions placed on it by the manufacturer. Result:
sda1: VAT
sda2: Swap
sda3: ext4 for /
sda4: ext5 for /home
sda6: fot future use, no fs on it.

Installation went smooth until first reboot. De system then immediatly starts a network boot (searching for a DHCP server).
When the DVD is in the system, it boots from it (as expected).

I started the rescue system from the installation DVD and inspected the VAT fs by mounting it. It has EFI/opensuse/grub64.efi. That looks OK to me.
The root file system also has the normal contents.

In the BIOS I see in the Boot Sequence screen:
UEFI boot resources
. ATAPI cd-dvd-station
. opensuse
.....
Thus opensuse is seen as such, but nevertheless apparently can not be used.

Any ideas were to change things?