Docking connector port

follow this steps and fix it. God bless you

Bad cable connection

Check the USB cable for damage and dirt, especially at the ends. Then try using the wall charger, as this will provide greater power input than the computer/USB.

Broken charger or USB cord

Try using different chargers to see if you may have a problem with your charger or cord.

Obstructed/bad dock connector

Inspect the 30-pin dock connector at the bottom of the iPhone for dirt, lint, and damaged pins. Clean out the dock connector very carefully with a tooth pick or soft toothbrush. If the dock connector is broken, you will have to replace it.

follow the instruction and fix it. God bless you

Bad cable connection

Check the USB cable for damage and dirt, especially at the ends. Then try using the wall charger, as this will provide greater power input than the computer/USB.

Broken charger or USB cord

Try using different chargers to see if you may have a problem with your charger or cord.

Obstructed/bad dock connector

Inspect the 30-pin dock connector at the bottom of the iPhone for dirt, lint, and damaged pins. Clean out the dock connector very carefully with a tooth pick or soft toothbrush. If the dock connector is broken, you will have to replace it.

Bad cable connection

Check the USB cable for damage and dirt, especially at the ends. Then try using the wall charger, as this will provide greater power input than the computer/USB.

Broken charger or USB cord

Try using different chargers to see if you may have a problem with your charger or cord.

Obstructed/bad dock connector

Inspect the 30-pin dock connector at the bottom of the iPhone for dirt, lint, and damaged pins. Clean out the dock connector very carefully with a tooth pick or soft toothbrush. If the dock connector is broken, you will have to replace it.
God bless you

Your first option is to get Apple's iPod AV Cable (AU$29). Slide the 1/8-inch connector into your iPod's headphone port, connect the yellow, red, and white connectors on the other end of the cable to the corresponding RCA plugs on your TV, and you're in business. If you have an iPod Universal Dock, you can connect the iPod A/V cable to the dock's line-out port instead. You can then keep the A/V cable plugged in when you remove the iPod from the dock.

have a look at the port on your phone were u put the charging cord and see if the we part inside is broken or cracked and do the same on your power cord if u cant see anything wrong and u cheep u can always buy parts for them and take apart your iphone and replace the power socket

Check the connections, may it have some broken or damage connectors

There might be some issue with the docking ports. Try to connect a different iPod and see if its working, if its not working then there is some problem with the Dock connectors in the docking station.

Have you tried a different cable? If the cable is custom, sorry you will need to buy a new one to try it.
Plug in another USB device. Is this OK?
Do you use a USB Mouse? Try all the ports.
iPod cables are easily damaged. Ipod docks can be broken by force, twisting or dropping. Insert the iPod into the dock at the correct angle, gently.
Take care to insert the iPod cable straight, right side up. Do not drop the iPod with the cable inserted.
A foreign object like lint, dirt, paper or hair may be stuck in the connector. NEVER clean the connector with a metal object. Use a toothpick, carefully.

Remove Any Docking Stations or Port Replicators From the Computer Note: Docking stations and port replicators are optional equipment. If you are unsure if you have a docking solution attached to your computer, refer to Table 1 and Table 2 for examples. To remove the docking station or port replicator, perform the following steps: Shut down the computer. Remove the docking station: Universal Docking Stations: Disconnect the docking station's USB cable from the computer. D/Port or D/Dock: Remove any cable locks from the security slot on the right side of the docking station. Move the slide lock forward to the unlocked position. Press the Eject button and lift the computer from the docking station. C/Port II or C/Dock II: Remove any cable locks from the security slot on the left side of the docking station. Pull the locking lever forward until it stops to eject the computer, then slide the computer out of the docking station. Dell manufactures the following docking stations and port replicators (Table 1): D-series DocksC-series DocksSpecialty Docks D/PortLatitude? C/Port IIMedia Bases D/DockLatitude? C/Dock IIInspiron? Advanced Port Replicator Table 1: Dell Docking Stations (Click an image to enlarge it) Universal docking solutions are also available from third-party manufacturers including, but not limited to, the products below (Table 2): TargusKensingtonBelkin Table 2: Universal Docking Solutions (Click an image to enlarge it) Reseat the Keyboard Connector to the Motherboard Caution: Before performing any of the procedures in this section, read and follow the safety instructions in Dell Knowledge Base Article: "Precautionary Measures for Personal Safety" Article ID: 339031. Reseat the keyboard connector to the motherboard. Be sure to handle only the connector and not the cable. For information about how to open the chassis and remove, reseat, and replace components, please refer to your Online User's Guide and browse to the Replacing and Removing Parts section. Remove All Power Sources and Reset the Computer Remove the battery and disconnect the AC power adapter from the computer. Note: For information about how to open the chassis and remove, reseat, and replace components, refer to the Online User's Guide. Click Systems, then the make and model of the computer. Download the Owner's Manual or User's Guide and refer to the Adding and Replacing Parts section. Press and hold the power button for 10 seconds. Reattach the AC power adapter to the computer. Power the computer on. Replace the Internal Keyboard

There are several possible reasons:

1. You have damaged the USB port of your PC. Try in other USB port or other computer to check if the Ipod is recognized.

2. The USB cable is damaged. Try another one.

3. The ipod has either damaged the main board or the dock connector port. Ther is not solution but replace the damaged part and it needs to be done by somebody that knows how to do it.

4. Sometimes the dock connector port is dirty. Using a magnifier with light, you can check if this is the case. If so, blowing compressed air will remove the dust and dirty, or if there is something liquid (such coke residues), you can use a dry and clean rag or napkin will do the work, but you have to do it very carefully so you won't bend or damage the metal contacts.
Best regards,