This could be a BIOS issue (you are running the latest available BIOS, right?) or it could just be a Windows issue...
First of all, do not pull the plug like this; this is the most damaging thing that you can do in this situation. When it gets into this state, shut it off using the power button. If a single touch doesn't work, hold it down for 4 seconds and it will always power it off completely (this is a non-maskable hardware feature in the chipset/SOC).
Hope this helps,
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I am following up on your case. Let me know if Scott’s suggestion solves the issue.
If the problem continues, please provide with more details of the problem. Tell me if you are getting any error message as soon as you select shutdown.