Hello IIINobleIII,
Can you provide us your system specs? This can be of great help and will enable me and the TH members to help you better
🙂
With that said, there could be numerous factors that cause a system to shut down. I think it has to do with your power supply. Take a look a this video to get a better insight into this type of issue:
http://www.youtube.com/watch?v=tiqkPRtzu70&list=PL6CFEA6C71BB14979&index=3
Now, your GPU, the R7 250X requires a 400w power supply. I see that you have a 430w PSU (by the way, Corsair is a great brand - good choice). This requirement is "suggested" by the GPU manufacturer, however is it best to get something more powerful than what is normally suggested. In your case, I suggest getting a 500 or 550w PSU.
See, when you're close to the suggested power, you're more likely to run into an issue like yours because of the other components in your PC drawing power at the same time. Hence, the system shutting down on you.
A great way to prevent such issue or learn more about your power requirements is using a power supply calculator, for example:
http://www.extreme.outervision.com/psucalculatorlite.jsp
Would you happen to have an extra, more powerful PSU? Can you borrow one from a friend? If so, try swapping them and see how it goes...
About the driver, we have just released the Catalyst 14.2 Beta driver:
http://support.amd.com/en-us/kb-articles/Pages/latest-catalyst-windows-beta.aspx (On this page, you'll find instructions on how to do a clean install - uninstall existing drivers and install the latest version)
I hope the above information helps you...and please keep us updated on your progress
🙂