Did my psu blow out? Or could it be MotherBoard?

Ok... I just got this computer in the mail yesterday. I pluged the monitor and other stuff up to it. Brand new computer BTW. I had it on for 10 minutes tryin to figure out why my monitor was not getting a signal, because the computer was on and it was connected. I think maybe I should have had the monitor connected to the video card, but I had it connected in the other monitor socket that goes to the mother board, but that is beside the point. Anyhow, while I was screwing around in the back of the computer. I went to adjust the power plug, into the psu (Why I do not know) but i pushed it in or wiggled it, which proves to have been a very stupid mistake on my part, and then It kinda made a popping sound like, i don't know may a shock or a blown fuse, Coming from the area of the psu power plug and unit, then I remember there being like faint plastic burning smell. But the computer powered off and I could not get it back on. Now , even though I have done this many times and never had it happen, I believe that when I was messin around back there , that maybe I caused a spark of static somehow that blew out my PSU. I am not really too worried about it, I have another part coming right now. What I am worried about is what if it is my motherboard and not the PSU, or what if not only did the PSU get damaged, but the MOBO did aswell. I know that if the computer does not power up at all, then there can be 2 problems. Bad PSU or Bad MOBO. The people at IBP said that they tested the system and that the power wattage is fine, that it was probably a faulty PSU then. I was also worried that when I hook this new one up that the same thing is going to happen again. Or that I might plug in something that doesn't need to be plugged in. I'm just a lil surprised that the first 10 minutes of it being on that something like this happened and I find it kinda hard to believe that me adjusting the power plug would be enough to blow out a brand new PSU. So , what do you guys think? Also , what is the easiest way of testing this motherboard , without having to hook up a PSU to everything? I got a Dell PSU , but it is 305 Watts and the cords are not long enough, because they were designed for that machine only. But I think I might want to use it to test my motherboard. And when I do hook up the new PSU to my system I know where the plugs should go pretty much. I know which one goes to HD, and the 4 socket ones that go to the MOBO and other components, but my question regarding that is, what if I plug something up that doesn't need to be plugged up? IS that gonna damage anything? I am really tryin to be carefull with this computer. It is my first customized gaming computer I bought from Ibuypower, and not one that I got from Dell , or Best Buy. I have invested alot of money into , and plan on upgrading alot of things in the future as I see the need to. This lil incident within the first 10 minutes of the ccomputer being on though, has kinda got me wandering if I shouldn't have just ot a Dell.