Possible causes....
Faulty ICD2
Faulty or wrong cable between target board and ICD2
Problem with the powersupply on the target board
Target board contains circuitry that prevents the ICD2 from functioning:

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Make sure you read and understand the section in the ICD2 manual that covers the hardware connections. There's also a complete chapter on troubleshooting which I suggest you read.

Apart from that I'm afraid I can't help much since I don't have an ICD2 myself. Since you have a supervisor perhaps you could consult him/her.

/Henrik.