Upgraded PSU, but fan not working, NEVER spins.

[Muhilla]

Hello! I upgraded my PSU from 310W SFF to a 400W SFF, purchased from HP Parts, to accomodate a new graphics card. Everything works great, but about once a day the computer just shuts off. I have to unplug the power supply for a few minutes and reconnect then restart. The graphics card is staying cool and fans are functioning properly. I have noticed, however, that the PSU fan NEVER spins at start up, at shut down, during operation, never. This power supply, like the original 310W, has the proprietary 7 pin motherboard connector. The difference is that the original PSU only had 3 actual wires on the 7 pin connector while the 400W has a ll seven filled. Could the extra 4 wires be causing a communication problem with the motherboard, or did I just get a defective PSU?  What are the other 4 wires used for? Any help you can give would be appreciated. Thanks.

[wb2001]

@Muhilla,

Congratulations on being the first person to report you found a link within HP for a 400W PSU that was supposedly suitable for the HP 590 series computer with a LINCS motherboard.  Could you post the link,  as HP PartsSurfer does not list any other PSU but the 310W.

[Muhilla]

Thank you for your response.  An update to my problem. I updated my BIOS this morning, and I have not had a spontaneous shut down since. The fan still has not turned on to my knowledge. Does it need to reach a certain temperature in order for the fan to turn on or is it supposed to be on? Here is the link to the PSU: 

https://parts.hp.com/hpparts/Search_Results.aspx?mscssid=E2DE572849C240C0B41302989018C9BB&SearchIn=P...

Part number is L04618-800

[wb2001]

@Muhilla,

Your link should have opened a world of possibility for all owners of these units.

Alas, the inline 7 pin should have only 3 wires according to the photo's submitted by chris, see here.  Just scroll down to the actual pictures. It clearly shows the 3 wires on a 7 pin socket.

Why HP offers a replacement PSU (correct part number) with improper wiring is beyond my un-paid  level.

[Cheron-Z]

@Muhilla

I have brought your issue to the attention of an appropriate team within HP. They will likely request information from you in order to look up your case details or product serial number. Please look for a private message from an identified HP contact. Additionally, keep in mind not to publicly post personal information (serial numbers and case details).

If you are unfamiliar with how the Support Community's private message capability works, you can learn about that here.

Thank you for visiting the HP Support Community.

[Muhilla]

@WB2001

Thanks for the response. At the moment I would say my 400W PSU solution is not an easy one and it is not complete. I have HP trying to help me, but in the mean time I figured I would give an update. I think the 400W PSU I got from HP Parts (Part #-L04618-800)  connects to the motherboard with  3 extra wires in the 7 pin proprietary connection. These extra 3 wires must act like a switch to cause the fan to spin at different rates depending on use and temperature I would assume. The motherboard does not like these extra 3 wires and the fan will not spin. In my attempts to mess with the wiring on the connector I got the fan to act normal at startup and shutdown (normal on off, but not continuous  by removing one of the wires.  In another instance by keeping just one wite the PSU fan was full out jet engine strong. But no happ median I am afraid. I just wish I could talk to a tech with knowledge of systems to tell me what is going on. Why is that not possible with  HP? I can't even find a schematic of the motherboard or PSU wirring anywhere on the web. that is so abnormal in the computing world.