急求icd2调试帮助！！！！！！

[afei8856]

Connecting to MPLAB ICD 2
...Connected
Setting Vdd source to MPLAB ICD 2
ICDWarn0020: Invalid target device id (expected=0x71, read=0x0)
...Reading ICD Product ID
Running ICD Self Test
...Passed
MPLAB ICD 2 Ready
Programming Target...
ICDWarn0052: MPLAB ICD 2 cannot validate a target device. Please make sure that the target device is connected and properly powered. Select "OK" to continue, or "CANCEL" to abort the operation
ICD0200: Operation Aborted (Warning 51).
ICD0275: Programming failed.
MPLAB ICD 2 Ready
我在进行编程时出现以上结果，检查硬件没有什么问题，配置也没发现毛病，到底是怎么回事？急需帮助！！！！！！

[akendy]

我也出现这样的问题,换一块板子试又是好的.郁闷