"PC problem" Windows7 CPU and fans continue to operate after shutdown-troubleshooting logs

Nikki recently on a whim himself assembled a desktop (in fact, mainly to play Wow), helpless is not the hardware of the small white, according to the hardware area of the Great God Guidance Group set up, excitedly bought their own spell, but in the process of using the occasional Windows7 shutdown, The CPU and the fan continue to operate. Use a little time to troubleshoot problems over the next few days.

Problem Description:

1. Display black screen after shutdown, but for signal input status
   

2. The CPU fan continues to operate, the fan comes with a blue light

3. The CPU power LED is on, the hard drive light is occasionally lit

4. Shut down the computer immediately after power-on, no problem with the shutdown

5. After the problem, use the Restart button on the chassis to restart the computer, the DOS interface prompts the abnormal shutdown, will allow the selection of normal startup or Safe mode to start, restart complete, shut down the computer, no problem
   

6. After a few times in the Wow game after a period of time, the shutdown of the above problems (currently no confirmation is associated with the Wow game, need to confirm)
   

7. 2 consecutive days of normal security software use, web browsing and other operations more than 3 hours, no problem with the shutdown
   

Motherboard Model: gigabyte (GIGABYTE) B85M-D3H motherboard (Intel B85/lga 1150)

Power Model: Delta rated 450W NX450 power supply (80PLUS bronze/12cm temperature-controlled mute fan/support back line)

Troubleshooting logs:

2014-12-08

Because the problem situation is not always present, so first of all do not consider the motherboard or power supply problems, starting from the software.

"PC problem" Windows7 CPU and fans continue to operate after shutdown-troubleshooting logs