Brian Buchanan, as per the restart man page, sudo restart won't reboot the box. 
Instead, one would want to do:
sudo reboot

** Tags added: latest-bios-a11 needs-upstream-testing raring regression-
potential

** Description changed:

  I'm experiencing a problem where issuing 'sudo restart' won't restart.
  The machine is headless, and when I check the KVM the screen is just
- black.  Pressing CTRL+ALT+DEL reboots the machine properly.
+ black.
+ 
+ WORKAROUND: Pressing CTRL+ALT+DEL reboots the machine properly.
+ 
+ WORKAROUND: sudo poweroff
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.8.0-38-generic 3.8.0-38.56~precise1
  ProcVersionSignature: Ubuntu 3.8.0-38.56~precise1-generic 3.8.13.19
  Uname: Linux 3.8.0-38-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 
k3.8.0-38-generic.
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', 
'/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c', 
'/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D1p', '/dev/snd/seq', '/dev/snd/timer'] 
failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info: Error: [Errno 2] No such file or directory
  Card0.Amixer.values: Error: [Errno 2] No such file or directory
  CurrentDmesg: [   67.307464] postgres (1791): /proc/1791/oom_adj is 
deprecated, please use /proc/1791/oom_score_adj instead.
  Date: Tue Apr  8 16:41:40 2014
  HibernationDevice: RESUME=/dev/dm-2
  InstallationMedia: Ubuntu-Server 12.04.3 LTS "Precise Pangolin" - Release 
amd64 (20130820.2)
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: Dell Inc. Precision WorkStation T7400
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=en_CA:en
   TERM=linux
   PATH=(custom, no user)
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-38-generic 
root=/dev/mapper/vg_c3430-root ro
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-38-generic N/A
   linux-backports-modules-3.8.0-38-generic  N/A
   linux-firmware                            1.79.11
  RfKill: Error: [Errno 2] No such file or directory
  SourcePackage: linux-lts-raring
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/30/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A11
  dmi.board.name: 0RW199
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 7
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA11:bd04/30/2012:svnDellInc.:pnPrecisionWorkStationT7400:pvr:rvnDellInc.:rn0RW199:rvr:cvnDellInc.:ct7:cvr:
  dmi.product.name: Precision WorkStation T7400
  dmi.sys.vendor: Dell Inc.

** Changed in: linux-lts-raring (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1304667

Title:
  System won't reboot after it's been on a while

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