just finished my first build. when i hit power button everything appears to power up but i can't get anything to show up on monitor. ive tried connecting to a tv with hdmi and to a monitor with vga but nothing. my psu has a 20 pin connector and a 4 pin connector wrapped up in the same bundle of wires so i assume those plug in to the 24 pin connector on mobo. there is also another 4 pin connector that i have tried plugging in to an 8 pin connector on mobo. what are typical troubleshooting steps?