Troubleshooting Cables

Cables and connectors are a very common source of problems. Here are a few suggestions for troubleshooting:

If a peripheral device doesn't work, always check the cables, especially if the device has been working recently.
Always check for loose connections.
Check for bent or broken pins on the connector. Bent pins can sometimes be repaired; however, they will always be susceptible to damage later, because the pin has been weakened. It is a good idea to mark these connectors and use them with care. A better idea is to replace them.
If a connector or cable doesn't fit or if you have to push hard to make the connection, something is wrong. Either a connector has been damaged or it is not the right match.
Check for worn or frayed cables. Replace if necessary.
Make sure you have the right cable. Some, such as null-modem cables, look just like standard communication cables, but will not work with a modem.
Always be wary of "homemade" cables.