Are you using the serial connection? Have you tried a different cable?
If older IMS, using Black Icon for 32 bit?
Try to build a new network by clicking on Net and adding a group and then click on group and add 2 cars.
You can also trying connecting to IMS on the CWIL board in the COP.
Check the voltage on the 3vdc battery also on the CPUA. Replace if under 3volts.
