Look in the Event Viewer for errors in the system and application logs. This is always a good place to start your gremlin quest.
It could be the psu because they use the bare minimum to keep costs down. Be sure you can use an ATX psu or you may smoke the machine.
Here's what I get ater the reboot:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.256.1
Locale ID: 1033
Additional information about the problem:
OS Version: 6_1_7601
Service Pack: 1_0
Files that help describe the problem:
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