Windows does not fully shutdown--case lights and fans remain on

Hi all.
My computer (Win 7 64-bit) is not shutting down properly. When I click "Shut Down," Windows appears to carry out the shut down process, and the display then goes blank. But power to
my case persists; fans and LED lights remain on. I have no idea if this is even a hardware (motherboard, power supply, conflict) issue or software issue (OS, BIOS, etc). Any ideas how I can pinpoint/troubleshoot the problem?
I tried booting into safe mode and shutting down from there, but after a couple seconds the process then froze on the Windows Shut Down screen.
My system specs are:
Motherboard: Gigabyte GA-P67A-UD3R-B3 (rev 1.x) (latest version of BIOS is installed)
BIOS: Latest for my motherboard (F9 I believe)
Processor: Intel Core i7
Memory: 8 GB DD3-1600 (4 x Kingston KHX1600C9D3K2)
Hard Drive: Western Digital Caviar Blue 1TB WD10EZEX (brand new)
Power supply: 700W Stronger SPSN-070P
GPU: Radeon 6850
This is a fresh Windows install, and all Windows updates are up-to-date
Thanks in advance.

OK below my event logs for the shutdown process, from 2 different systems:  the system with the shutdown issue (system 1) and a system with working shutdown (system 2).  The broken system reports 1 error during shutdown:
The Superfetch service terminated with service-specific error The operation completed successfully..
I can share the details from the event viewer if you'd like, but it's a lot of gibberish.  The most interesting would be:
[Name]  Service Control Manager 
[ Guid]  {555908d1-a6d7-4695-8e1e-26931d2012f4 
Unfortunately they are not identical systems  They are both running Win 7 32 bit, but the broken system (system 1) has no Windows Updates and no extra software installed.  The working system is up to date with Win updates, and has some more software
installed.  I also have event log (*.evtx) files of each shutdown process, showing details.  
Here are the full logs:
System 1:  Broken shutdown
Information 1/20/2015 7:33:15 PM
Microsoft-Windows-Kernel-General
13 None
The operating system is shutting down at system time ‎2015‎-‎01‎-‎20T12:33:15.375698400Z.
Information 1/20/2015 7:33:11 PM
Microsoft-Windows-Kernel-Power
109 (103)
The kernel power manager has initiated a shutdown transition.
Information 1/20/2015 7:33:11 PM
Service Control Manager
7036 None
The Windows Search service entered the stopped state.
Information 1/20/2015 7:33:10 PM
Service Control Manager
7036 None
The Plug and Play service entered the stopped state.
Information 1/20/2015 7:33:10 PM
Microsoft-Windows-UserPnp
20010 (7010)
"One or more of the Plug and Play service's subsystems has changed state. 
PlugPlay install subsystem enabled: 'false' 
PlugPlay caching subsystem enabled: 'false' 
Information 1/20/2015 7:33:10 PM
Service Control Manager
7036 None
The Cryptographic Services service entered the stopped state.
Information 1/20/2015 7:33:10 PM
Service Control Manager
7036 None
The Windows Management Instrumentation service entered the stopped state.
Information 1/20/2015 7:33:10 PM
Service Control Manager
7036 None
The Software Protection service entered the stopped state.
Information 1/20/2015 7:33:10 PM
Service Control Manager
7036 None
The Distributed Link Tracking Client service entered the stopped state.
Information 1/20/2015 7:33:10 PM
Service Control Manager
7036 None
The Desktop Window Manager Session Manager service entered the stopped state.
Error 1/20/2015 7:33:10 PM
Service Control Manager
7024 None
The Superfetch service terminated with service-specific error The operation completed successfully..
Information 1/20/2015 7:33:10 PM
Service Control Manager
7036 None
The Superfetch service entered the stopped state.
Information 1/20/2015 7:33:10 PM
Service Control Manager
7036 None
The Diagnostic Policy Service service entered the stopped state.
Information 1/20/2015 7:33:10 PM
Service Control Manager
7036 None
The Windows Event Log service entered the stopped state.
Information 1/20/2015 7:34:11 PM
EventLog 6013
None The system uptime is 10 seconds.
Information 1/20/2015 7:33:09 PM
Service Control Manager
7036 None
The Diagnostic Service Host service entered the stopped state.
Information 1/20/2015 7:34:11 PM
EventLog 6005
None The Event log service was started.
Information 1/20/2015 7:33:09 PM
Service Control Manager
7036 None
The User Profile Service service entered the stopped state.
Information 1/20/2015 7:34:11 PM
EventLog 6009
None Microsoft (R) Windows (R) 6.01. 7600  Multiprocessor Free.
Information 1/20/2015 7:33:09 PM
Service Control Manager
7036 None
The DHCP Client service entered the stopped state.
Information 1/20/2015 7:33:09 PM
Service Control Manager
7036 None
The Power service entered the stopped state.
Information 1/20/2015 7:33:09 PM
Service Control Manager
7036 None
The Human Interface Device Access service entered the stopped state.
Information 1/20/2015 7:33:09 PM
Service Control Manager
7036 None
The Diagnostic System Host service entered the stopped state.
Information 1/20/2015 7:33:09 PM
Microsoft-Windows-Dhcp-Client
50037 Service State Event
DHCPv4 client service is stopped. ShutDown Flag value is 1
Information 1/20/2015 7:33:09 PM
Microsoft-Windows-DHCPv6-Client
51047 Service State Event
DHCPv6 client service is stopped. ShutDown Flag value is 1
Information 1/20/2015 7:33:09 PM
Service Control Manager
7036 None
The Group Policy Client service entered the stopped state.
Information 1/20/2015 7:33:09 PM
Microsoft-Windows-Winlogon
7002 (1102)
User Logoff Notification for Customer Experience Improvement Program
Information 1/20/2015 7:33:09 PM
EventLog 6006
None The Event log service was stopped.
Information 1/20/2015 7:33:09 PM
USER32 1074
None "The process C:\Windows\system32\winlogon.exe (DUSKWOOD) has initiated the power off of computer DUSKWOOD on behalf of user duskwood\snarl for the 
System 2:  Working Shutdown
Information 20/01/2015 11:15:29
Microsoft-Windows-FilterManager
6 None
File System Filter 'aswSP' (6.0, ‎2014‎-‎11‎-‎18T16:06:36.000000000Z) has successfully loaded and registered with Filter Manager.
Information 20/01/2015 11:15:27
Microsoft-Windows-FilterManager
6 None
File System Filter 'aswSnx' (6.0, ‎2014‎-‎11‎-‎21T18:16:29.000000000Z) has successfully loaded and registered with Filter Manager.
Information 20/01/2015 11:15:15
Microsoft-Windows-FilterManager
6 None
File System Filter 'FileInfo' (6.1, ‎2009‎-‎07‎-‎14T06:21:51.000000000Z) has successfully loaded and registered with Filter Manager.
Information 20/01/2015 11:15:15
Microsoft-Windows-Kernel-General
12 None
The operating system started at system time ‎2015‎-‎01‎-‎20T04:15:15.375199800Z.
Information 20/01/2015 11:14:17
Microsoft-Windows-Kernel-General
13 None
The operating system is shutting down at system time ‎2015‎-‎01‎-‎20T04:14:17.541276400Z.
Information 20/01/2015 11:14:11
Service Control Manager
7036 None
The Windows Image Acquisition (WIA) service entered the stopped state.
Information 20/01/2015 11:14:11
Microsoft-Windows-Kernel-Power
109 (103)
The kernel power manager has initiated a shutdown transition.
Information 20/01/2015 11:14:08
Service Control Manager
7036 None
The Windows Search service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The Intel(R) Management and Security Application Local Management Service service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The avast! Antivirus service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The Superfetch service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The Volume Shadow Copy service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The Windows Modules Installer service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The Windows Font Cache Service service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The IKE and AuthIP IPsec Keying Modules service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The Cryptographic Services service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The WLAN AutoConfig service entered the stopped state.
Warning 20/01/2015 11:14:07
Microsoft-Windows-WLAN-AutoConfig
4001 None
"WLAN AutoConfig service has successfully stopped.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The Software Protection service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The IPsec Policy Agent service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The Windows Defender service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The Windows Management Instrumentation service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The Windows Event Log service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The Microsoft Software Shadow Copy Provider service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The Security Center service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The Function Discovery Resource Publication service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The Extensible Authentication Protocol service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The Distributed Link Tracking Client service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The Intel(R) Management and Security Application User Notification Service service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The Desktop Window Manager Session Manager service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The Office Software Protection Platform service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The User Profile Service service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The Plug and Play service entered the stopped state.
Information 20/01/2015 11:14:07
Microsoft-Windows-UserPnp
20010 (7010)
"One or more of the Plug and Play service's subsystems has changed state. 
PlugPlay install subsystem enabled: 'false' 
PlugPlay caching subsystem enabled: 'false' 
Information 20/01/2015 11:15:50
EventLog 6013
None The system uptime is 35 seconds.
Information 20/01/2015 11:15:50
EventLog 6005
None The Event log service was started.
Information 20/01/2015 11:15:50
EventLog 6009
None Microsoft (R) Windows (R) 6.01. 7601 Service Pack 1 Multiprocessor Free.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The Power service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The PDQ Deploy service entered the stopped state.
Information 20/01/2015 11:14:07
Service Control Manager
7036 None
The Human Interface Device Access service entered the stopped state.
Information 20/01/2015 11:14:06
Service Control Manager
7036 None
The Diagnostic Service Host service entered the stopped state.
Information 20/01/2015 11:14:06
Service Control Manager
7036 None
The Diagnostic Policy Service service entered the stopped state.
Information 20/01/2015 11:14:06
Service Control Manager
7036 None
The DHCP Client service entered the stopped state.
Information 20/01/2015 11:14:06
Microsoft-Windows-Dhcp-Client
50037 Service State Event
DHCPv4 client service is stopped. ShutDown Flag value is 1
Information 20/01/2015 11:14:06
Microsoft-Windows-DHCPv6-Client
51047 Service State Event
DHCPv6 client service is stopped. ShutDown Flag value is 1
Information 20/01/2015 11:14:06
Service Control Manager
7036 None
The Diagnostic System Host service entered the stopped state.
Information 20/01/2015 11:14:06
Service Control Manager
7036 None
The Bonjour Service service entered the stopped state.
Information 20/01/2015 11:14:06
Service Control Manager
7036 None
The AMD External Events Utility service entered the stopped state.
Information 20/01/2015 11:14:07
EventLog 6006
None The Event log service was stopped.
Information 20/01/2015 11:14:06
Service Control Manager
7036 None
The Group Policy Client service entered the stopped state.
Information 20/01/2015 11:14:06
Service Control Manager
7036 None
The Windows Update service entered the stopped state.
Information 20/01/2015 11:14:05
Microsoft-Windows-WindowsUpdateClient
27 Windows Update Agent
Automatic Updates is now paused.
Information 20/01/2015 11:14:05
Microsoft-Windows-Winlogon
7002 (1102)
User Logoff Notification for Customer Experience Improvement Program
Information 20/01/2015 11:14:05
USER32 1074
None "The process C:\Windows\system32\winlogon.exe (TEACHER) has initiated the power off of computer TEACHER on behalf of user TEACHER\LENOVO for the following reason: No title for
this reason could be found
 Reason Code: 0x500ff
 Shutdown Type: power off
 Comment: "
Information 20/01/2015 11:14:02
USER32 1074
None "The process Explorer.EXE has initiated the power off of computer TEACHER on behalf of user TEACHER\LENOVO for the following reason: Other (Unplanned)
 Reason Code: 0x0
 Shutdown Type: power off
 Comment: "
Information 20/01/2015 11:13:52
Microsoft-Windows-Eventlog
104 Log clear
The System log file was cleared.

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