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The ZENworks Imaging Environment fails to reboot on Dell Optiplex 380 machines requiring a hard reset of the machine.
workaround:
update the z_maint.cfg file with the kernel options "acpi=off nolapic"

i.e.
change:

ZENWORKSAPPEND 1
DEFAULT imaging
LABEL imaging
kernel boot\linux
append 5 initrd=boot\initrd mode=5 rootimage=/root install=tftp://$PXESERVER/boot splash=silent vga=0x314 tftptimeout=50 $KERNEL_PARMS

to

ZENWORKSAPPEND 1
DEFAULT imaging
LABEL imaging
kernel boot\linux
append 5 initrd=boot\initrd mode=5 rootimage=/root install=tftp://$PXESERVER/boot splash=silent vga=0x314 tftptimeout=50 acpi=off nolapic $KERNEL_PARMS

Save the change to the z_maint.cfg file

The optiplex 380 machines should now reboot successfully from the ZENworks Imaging Environment