Hello, i recently build a new computer. I'm not gonna list every part yet, but i am going to explain my problem in detail. I decided it was time to get a new computer so i purchased some new parts on newegg. A couple days later the parts came and i got all excited. After putting all the parts together in a case and plugging in the power supply, i got really disappointed. When i switched the power supply on button in the back of the computer, i tried turning on the comp and no go. It only gave this really annoying screeching sound. I suspect its a dead motherboard maybe. I need help asap! The mobo is : ASUS P5N-E SLI LGA 775 NVIDIA nForce 650i SLI ATX Intel Motherboard. I'm 100% i plugged everything in the right slot (power supply).