|You can and should bench test all new systems. You need only the following hardware.|
MBoard, power supply, CPU/w heatsink/fan, one stick of memory, integrated graphics or graphics card, keyboard, monitor.
DO NOT connect any other components. You can lay the board on a piece of cardboard with the case on the side with the power supply mounted in the case. ONLY connect the 24 pin main power connector, the auxiliary CPU connector, any required power connectors for an installed graphics card.
Start the system by momentarily shorting out the two power connector pins on the motherboard.
If the system posts, you can connect the case to motherboard wiring and then the remaining RAM. Test again in between additions. Then you can add drives, USB, etc.