Rev it up a bit

Which of these would be the best way to troubleshoot startup errors on a motherboard?

A) Check for continuity with a multimeter

B) Connect to an expansion slot with a POST test card

C) Use a loopback plug on the Ethernet port

D) Confirm the storage device voltage levels with a power supply tester

E) Run diagnostics from the Windows Control Panel

F) Put down those jumper cables