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...n may be more prosaic. Here is the situation. I am using FC4 on an EM64T host with the Xen mods - VT enabled. I have two VMs. VM1 is Win XP (32 bit), VM2 is RHEL4U1 (32 bits) booting to run level 3. In most case this works fine. However, if I run a vnc server in the FC4 host so I can dempo the system, then as soon as I start VM2, the host immediately crashes and reboots. I am running the stock x11vnc server. I am guessing that this is related to memory, so for the record, here is how memory is setup. Physical host has 2 Gig. Kernel /xen.gz dom0_mem=1024M...