Proliant DL160SE G6 motherboard – does it need a 6 pin fan to be connected in order to POST?

I wanted to setup a 2 CPU server, but was not able to even POST with 1 CPU (x5550) and 4gb of ram (unbuffered).

I have only the following hardware connected:

1) VGA monitor (checked cables, it works elsewhere)
2) USB keyboard
3) SSD disk (also used other, new, working Samsung 2 TB disk)
4) CPU with passive heatsink
5) 680W PSU

No original, 6 pin fan was connected (there are 6 slots for them). I used molex type fans, hence motherboard thinks that there are no motherboard fans connected.
there are 8 green LEBs in the corner, blinking (no idea how to read them, no info that I could find in the HP materials for that motherboard). The motherboard starts immediately when the PSU is in on position – I noticed a red, single blink of a led next to CPU2 and CPU2_RAM slot (I assume it is to indicate that there is no CPU/RAM in #2 slot).

Would the regular, 6 pin fan connected to motherboard solve the problem (and if so, how many are needed at minimum)?


No, this won’t work.

I don’t know where you obtained this equipment or why its missing fans, but you’re not using it as intended. HP servers don’t post without the requisite set of fans.

In this case, there are SIX fan slots. You need FIVE in order for the server to operate. Please see the maintenance guide for this server.

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Source : Link , Question Author : memento1984 , Answer Author : ewwhite

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