Random restarting from a new pc build.

I built a new HTPC and I'm getting seemly random shutdowns. Here are the parts:

Asrock a75m-itx mobo: http://www.amazon.com/gp/product/B005JI5B9I/ref=oh_details_o00_s00_i00

AMD a6: http://www.amazon.com/gp/product/B005I2YL4G/ref=oh_details_o00_s00_i01

8.2L Mini-itx Case: http://www.amazon.com/8-2L-Mini-itx-Case-1YR-IP-S20/dp/B002NXEROW/ref=sr_1_1?s=electronics&ie=UTF8&qid=1337923012&sr=1-1

And this ram: http://www.newegg.com/Product/Product.aspx?Item=N82E16820220570

Windows will load fine but after 5-10 mins it will suddenly shutdown.

I had one shutdown while trying to install win 7. After a restart I was able to install completely.

I updated the bios.

I've check temps in the bios they are around 35C and all the fans are spinning so I don't think it's an over heating issue.

I tried to plug in a tested and working 350W PSU into the the motherboard to see if it's the case PSU but it won't power on with it plugged in. The CPU fan will spin but no video? After plugging back in the case PSU it will power on with video.

Since I'm not getting any errors or a blue screen I want to think it's power related or the motherboard? Especially since it doesn't seem to like my other working PSU. Please let me know what you think because I'm at my wits end. Thanks!
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  1. I would lean towards power, faulty motherboard would either not power up or would BSOD...usually. You must be careful when using a power supply that is not fully installed because of grounding concerns, along with possibly forgetting to switch something over to the new power supply.
    Power supply problems are the most frustrating because they usually limit your ability to diagnose to simple guess-and-check on hardware, or a frantic search for error codes before the system shuts down or restarts, and Windows does not record specifics of power failures, usually just "unexpected shutdown".

    I hope this helps, and I feel your pain.
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