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First, strip the machine down to just the MB, CPU, RAM and vid card. If problems continue, you may want to pull the MB out of the case to be sure its not shorting out on something.
Next step is to clear CMOS, and make sure every jumper on the MB is set properly. Check for BIOS POST beep when you boot (make sure the MB has a built in speaker, or attach one)
Also make sure the HSF is properly plugged in (to the correct fan header), and its working - some boards won't boot if there's no HSF fan signal.
If you still get nothing, you're in kind of a tuff situation. The "no video" problem could be caused by problems with the monitor, MB, CPU, video card, or RAM. (sometimes you'll get POST beep codes to help diagnose the problem, but not always.
At that point, its really a matter of "trial and error". You need to either swap known good parts into the system you're building, or test the new parts in another system. Since its an FX-51, chances are you won't have a way to test the MB or processor (unless you happen to have another FX-51 laying around). So the best you can do is try to eliminate the monitor, video card, and RAM as the problem. There is a slight chance it could even be a power supply issue, so you might want to check that as well.
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