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What is the power supply wattage?... For a system with a video card HD 3600 you need a power supply of at least 450w 500w. Please check the next link for detail information about the power supply requirements for this system board: page 56
Try to test the system wit the onboard video, so you can isolate the problem a little bit more.
Please bear in mind the Intel® Desktop Board D946GZIS is End of Interactive Support and the information and support is limited to the Intel site.
I'd recommend checking the hints found at the "Troubleshooting system boot issues" section here:
Other helpful links: