Which would you do first when troubleshooting a faulty monitor?

Which would you do first when troubleshooting a faulty monitor?

1. a) Check its connections to the computer and power source
2. b) Use a meter to check the CRT and internal circuitry for continuity
3. c) Power down the monitor, then turn it on again to see if that corrects the problem
4. d) Power down the computer, then turn it on again to see if that corrects the problem