Pxe boot is working okay, the driver e1000e is found by the system, but
then i get the message " sending dhcp request to eth0 " and no more happens

In the last line at the system information / kernel messages i can se this text:
"49.136333. eth0: no ipv6 routers present"

Could it be that the driver setting is forced to only use ipv6 an not ipv4..?

I am running the newest "zenworks imaging driver update for may 2010"
on a ZDM7SP1.

The older laptops are working fine on the system.....included t510

thats weird isn't..?