64-bit kernel fails to load on OptiPlex 960

[kallisti5]

The 64-bit kernel fails to load on the Dell OptiPlex 960.

Serial connected shows:

size: 37.6 cm x 30.1 cm
border: 0 cm x 0 cm
Serial Number: G434H87FGB2U
Monitor Name: DELL 1908FP
Horizontal frequency range = 30..81 kHz
Vertical frequency range = 56..76 Hz
Maximum pixel clock = 140 MHz
crtc: h 1328/1440/1688, v 1025/1028/1066, pixel clock 108000000, refresh 6064
Welcome to the Haiku boot loader!
number of drives: 2
add_partitions_for(0x00105420, mountFS = no)
add_partitions_for(fd = 0, mountFS = no)
0x00105648 Partition::Partition
0x00105648 Partition::Scan()
check for partitioning_system: GUID Partition Map
check for partitioning_system: Intel Partition Map
  priority: 810
check for partitioning_system: Intel Extended Partition
0x001057c0 Partition::Partition
0x00105648 Partition::AddChild 0x001057c0
0x001057c0 Partition::SetParent 0x00105648
new child partition!
0x00105648 Partition::Scan(): scan child 0x001057c0 (start = 4194304, size = 629145600, parent = 0x00105648)!
0x001057c0 Partition::Scan()
check for partitioning_system: GUID Partition Map
check for partitioning_system: Intel Partition Map
check for partitioning_system: Intel Extended Partition
0x00105648 Partition::~Partition
0x001057c0 Partition::SetParent 0x00000000
boot partition offset: 4194304
0x001057c0 Partition::_Mount check for file_system: BFS Filesystem
PackageVolumeInfo::SetTo()
PackageVolumeInfo::_InitState(): failed to parse activated-packages: No such file or directory
load kernel kernel_x86_64...
<LOCKUP>

A random mixture of BIOS / boot options tried.

Intel Core 2 vPro

Boot was attempted with intel_extreme driver blacklisted for good measure, no changes.

Will follow up with 32-bit testing.