Which of the following connector types would MOST likely be used to charge a laptop computer?

After a technician installs hardware and turns on a system the PC does not complete POST and only displays a black screen Which of the following should the technician try FIRST to fix the issue?

A user receives a replacement modem/router combination device from an ISP and plugs it in. A laptop connected to the router via WiFi receives an address in the 192.168.0.x range but is unable to access the Internet. Which of the following would MOST likely resolve the problem?

A user reports that printing on heavy cardstock paper results in the image smearing if touched. When printing on plain paper, the problem does not occur.
Which of the following would be the NEXT troubleshooting step to perform?

A technician is servicing a laptop that cannot keep an IP address. When the laptop receives an IP address, it releases it and cycles through repeatedly. The technician has replaced the cable, plugged into a known good network jack, and successfully connected a different laptop. Which of the following tools should the technician use NEXT?