New DIY computer. Will not send signal to monitor

I just built my own gaming computer and followed a guide step by step. It turned out fine and when I plugged it in the fans turned on and everything was working, but when I plugged it into my monitor, the monitor goes black and says "no signal". I have all the parts assembled and I have tried it without the graphics card, the same result. If my motherboard was underpowered would this happen?
Any help is appreciated :D

Monitor, No signal, DIY Computer, need help, ASAP
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  1. start here

    you must go though this guide first before we can help u let us know if you found ur problem or still need help after trying all the items in it. (I got in trouble for helping someone else for this with out sending them though the guide first)
    we will assume you checked all these items so really go though the list
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