Can't install the 64bit Version of 11.x

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http://forums.opensuse.org – Hello, at first excuse my very bad english. I'll try to explain my problem, i hope you understand. My problem: If I boot from the opensuse 64bit DVD (Ver.11.0/11.1/11.2 - its the same effect)-the bootmenu appears-i choose to install opensuse in the menu- now the kernel is loading-then i see shortly the next screen-and then my notebook reboot. I have the effect also in the live-version 64bit. The 32bit version works properly. My notebook: Lenovo N500 4233-47G Original description: T5800(2GHz), 4GB RAM, 320GB 5400rpm HD, 15.4in 1280x800 LCD, 256MB nVIDIA GeForce 9300M, CDRW/DVDRW, Intel 802.11agn wireless, Bluetooth, Modem, 10/100 Ethernet, Touchpad, Camera, 6c Li-Ion Now an important effect: if i remove one ram module (then i have 2GB), the installation works without any problems!!! 2 new RAM Modules i build in –> same problem i haven't any problems with vista 64bit or Ubuntu/Kubuntu 64bit, but the same effect with mandriva 2010.0 64bit. Do you have any idea??? i need a solution! Greetings from Kiel/Germany harry (Distributions)