Firsts of all to make it clear I am novice at programming and controllers. I was called to a costumer who has four machines that do identical work with same controller Micrologix 1400 and panelview 1000 plus for hmi . The costumer wanted a small change in the code on all machines so my idea was since it is the same program to upload the program from one machine make the code change and reinstall it on all processors with their respective ip and node changes. I uploaded the program from machine #1 and made changes and downloaded the improved program back to machine #1 following the routine of putting the processor in program and run mode. Tested new code out and it worked fine so proceeded to machine #2 processor first uploaded the original program and then proceeded in to downloading the improved program from machine #1 in to machine #2 . Prior to downloading the program changed the Node number and ip address in the controller properties to match machine #2 and also changed the ip address in the channel configuration channel one. Proceeded to download the new code and got prompted just like a regular download in which I continued and after the download was complete I switched the processor from program to run mode and all was fine. I proceeded to do a power cycle for the setting to take place and now the controller will not power up. I have not checked for power at controller but will be going back to it tomorrow and was wondering if I can get on advise on what can I check or do to the controller if power at controller is ok. Sorry on a long post and thank you on all of your responces.