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Today I scheduled to move some components of one of the file servers I was using to another one and remove this 4U server from the rack. Another Dell PowerEdge 2600 was waiting to get those components installed. I added the memory, harddisks and the second Intel Xeon 2.4 GHZ CPU and I than turn on the server. The server started but no input on the tft monitor . Hhm I than started to remove one by one of the new components I installed into the system. First memory than harddisks and in the end I removed the second installed CPU and the system boot. I than add memory and harddisks and server come up again.  

So I ended with this second CPU and the server did not boot if it was installed. I started to google and basically did not find anything in the right direction. My last option was Dell support website and I logged on with my registered account, located the system with System tag and went to the servers documentation. After reading for couple of minutes in the Microprocessor Upgrade Kit Contents section I realized I had forgot to add the VRM .
What is VRM??
VRM is the voltage regulator module that senses the microprocessor’s voltage requirements and ensures that the correct voltage is maintained.

I installed the VRM module in the second VRM connector and booted the system. It detected my second installed cpu ;).

Two 2.4 GHZ Processors, Processor Bus: 400 MHz, L2 cache 512 KB Advanced