My blackberry 8310 is not connected with data cable ,i already install cd in pc but it it is not showing in my computer
You can try this: To get the PC to recognize the blackberry, leave the Blackberry plugged in and take the battery out. Leave it out for 5 seconds and put it back in. See if it detects after that. If you're referring to it not connecting on Desktop Manager, you have to go to Options > Connection Settings, select None in the drop-down and then click Detect. source