How to troubleshoot a Computer Monitor
Computer Monitor Doesn’t Display Anything
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Is the monitor turned on? Check the green LED power on the monitor if it has one.
* Adjust the brightness nod contrast controls all the way to Maximum
Check the video cable from the monitor to the computer to be sure it is properly [...]

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Modem Troubleshooting
Cannot call out or receive calls.
Make sure the phone line is clear and operable by calling out with a telephone.
Double check that the parameters for baud, parity stop bits, etc.. have been set properly.
Check that the COM ports are matched between the hardware and the communications software
Check that you have the proper COM port [...]

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