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According to BIOS post codes the Error 5A means Resetting PATA/SATA bus and all devices
http://www.intel.com/support/motherboards/desktop/sb/CS-025434.htm Desktop Boards — Port 80h POST Codes
Try updating BIOS on your computer and test:
https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=18302 Intel® Download Center
Your graphics card may require higher power supply as well.