I built this computer and I am honestly not sure if I hooked up all the wires. I am not sure but when I turned it on the first time everything kicked on and there was no visual and I saw that my graphics card was not on. I connected it and then still nothing, I find that the hard drive was not connected and I plugged it in and when I tried to turn it back on it flickers once and it cuts off. Any help would be appreciated.