HP ML350 G6 second CPU

Hello,

I have server HP ML350 G6 with 1 CPU E5540. I'd like to add second processor.

Server have 3 fans (2 back and 1 front).

After install 2nd E5540 with heat sink 508876-001 and RAM similar like for first processor server doesn't start. Only fans work with full speed, no leds flash on the system board.

Processor and RAM are good, because I install them in first slots, and work well.

Do you have any idea what can I do to make good start?

Thanks for help.