Watch out for the Jeantech Psu - they are rubbish quality, and more likely to cause a problem than solve it. Try running out of case with minimum setup, just cpu, memory, and system hard drive, Gpu - then add things back and see what causes problems.
I used a 350W Jeantech with a heavily overclocked HD4890 Black Edition and a heavily overclocked E8200 for about a week. It caused frame stuttering in gameplay, but nothing blew up

@OP have you tried using a graphics card other than the one which was in the system originally, and connected it with the same cable to the same monitor? Would be a way to check if it is the GPU itself or just the configuration of hardware causing no display output etc.
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