How comfortable are you about opening the case?
- Power the PC off
- Disconnect the power cord from the PC
- Open the side cover and disconnect/reconnect all cables, cords, cards, memory
- Replace the side cover
- Connect only the mouse, keyboard, speakers, and monitor to the PC
- Those USB devices should be plugged into the PC rear USB ports
- The PC power cord should be plugged directly into the wall socket (for now) and connect the other end into the PC
- Power the monitor on
- Power the PC on
- Test the PC