PC randomly shuts Down after hardware upgrade

I upgraded my pc and after about half hr it shuts Down and shows no error message on the ui. My specs are;

AMD FX-9590 Black Edition Octa Core CPU Socket (AM3+, 4.7GHz

Asus Crosshair V Formula-Z Motherboard

CMY16GX3M2A1866C9R Vengeance Pro Series 16GB (2x8GB) DDR3

Arctic freezer 13 cpu cooler

Ati Radeon 5850

750w psu

Samsung 250gb ssd

3tb hdd

Running Windows 8.1

All parts except the gpu and psu have been upgraded. It worked when I upgraded my ssd and hdd and installed windows 8.1 but the problem only appeared when I put in new motherboard cpu cooler and ram in. I have tried 2 different gpu and different ram sticks but the problem still persists. Error code on motherboard is "AA" when it shuts Down. I have made sure I updated my bios with my new specs and all drivers are updated.

It's been a problem for over a month and I'm starting to loose hope as I only upgraded because I wanted to get back into pc gaming. Sink alot of money into this (for me atleast) so would really appreciate any reply and will be happy to talk via social media or Skype to give an in depth evaluation of what I have and haven't tried.

Thanks
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More about randomly shuts hardware upgrade
  1. did you install new windows?
    monitor your sys,maybe overheating is the problem,use speedfan to do that.

    if above is already done,i will say you psu is the problem.
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