Not a dumb question.   The server requires slot 1 to be occupied, so if slot 1 is bad, then you are looking at a motherboard replacement to get the system back up and running.  If slot 2 is bad, then you would need to replace the motherboard to fix that too, but at least you could run on a single processor until then.  
We have power edge 2950 which is used as server for wincc application. It was running OK. During plant shutdown i shutdown it normally. I switched off its power and use blower fan to remove dust. After cleaning, it's not starting and given error of "E122C CPU" on LCD. I don't know what is this error and why this occur. When the power button is pressed, it tries to start but remain shut giving this error. Can anybody help me, what's the reason of this error and how it can be removed as it is a critical server. Help needed. Thanks
E122C lcd message on poweredge 2950