Our problem is that when power is first applied to our VME chassis where the 64C2 card resides, there are times when the D/A (F1) module gets in a 'latched-in' and 'over-current' condition. There is nothing connected to the D/A outputs. When the issue occurs, the NAI diagnostics indicate that the D/A module has an 'overcurrent' condition via query to the 'overcurrent' status register and we observe that the D/A output channels 1-4 are always at 0v.