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Dell optiplex case with hp motherboard

Hello. So I replaced the motherboard of my dell optiplex 390 with an Hp motherboard in order to support ivy bridge cpus (the dell bios didn’t). I’m sorta a noob ish, and im not that familiar with the motherboard connectors. Specifically, the front panel connectors. Some of the connectors don’t seem to fit... I think they are not the standard ones. The big connector goes to somewhere on the front pannel, and there’s no pins that match exactly like the dell motherboard did for it. There is one set of pins that is the same but has 2 extra pins (so 2x9 instead of 2x8, with a missing pin for the key (black one)). I’m not sure what it’s for or if I need it. Also, what I assume is the power button cable seems to fit into this other set of pins that is keyed similarly (2x3 with one missing bottom right) , but when I plug that in and press power, nothing happens. Any help? Thanks

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Also here is the original pins it connected to (the smaller one) 

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If the Dell case has front panel & power / HDD LED connectors that are non-standardized, those connectors aren't going to work with anything other than the proprietary motherboard that came with that series of Dell computer. Don't get me wrong - I like Dell computers, however, they custom design a lot of stuff because they share a lot of R&D with their server & workstation departments. HP usually uses Pegatron (ASUS sister company) motherboards so they're a bit more like standard computer motherboards you'd buy if building a system.

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20 minutes ago, kirashi said:

If the Dell case has front panel & power / HDD LED connectors that are non-standardized, those connectors aren't going to work with anything other than the proprietary motherboard that came with that series of Dell computer. Don't get me wrong - I like Dell computers, however, they custom design a lot of stuff because they share a lot of R&D with their server & workstation departments. HP usually uses Pegatron (ASUS sister company) motherboards so they're a bit more like standard computer motherboards you'd buy if building a system.

Do you know what those connectors are though? And is there a way to start the system without the button?

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3 minutes ago, Swordhero1 said:

Do you know what those connectors are though? And is there a way to start the system without the button?

No idea; I'd need to have a full service manual or know the Dell desktop's Express Service Tag or Service Code to look this up. You can short the power pins on the HP motherboard using a paperclip to fire it up, assuming the power supply in that Dell case is not proprietary as well.

Desktop: KRySTaLoGi-PC Build Log (i7-4790K, RTX2060) Mobile: OnePlus 5T | Koodo - Unlimited Calls & Texts + 12GB Data
Laptop: Dell XPS 15 9560 (the real 15" MacBook Pro that Apple didn't make) Tablet: iPad Mini 5 | Lenovo IdeaPad Duet 10.1
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7 minutes ago, kirashi said:

No idea; I'd need to have a full service manual or know the Dell desktop's Express Service Tag or Service Code to look this up. You can short the power pins on the HP motherboard using a paperclip to fire it up, assuming the power supply in that Dell case is not proprietary as well.

Which two pins is it?

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19 minutes ago, kirashi said:

No idea; I'd need to have a full service manual or know the Dell desktop's Express Service Tag or Service Code to look this up. You can short the power pins on the HP motherboard using a paperclip to fire it up, assuming the power supply in that Dell case is not proprietary as well.

Also the also the device number is 45Y66V1

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7 minutes ago, Swordhero1 said:

Also the also the device number is 45Y66V1

Thanks! Looks like the smaller connector you're holding is the power switch, and the larger one is for the front panel. Both of these are proprietary, so unless you're willing to rip the wires out of the connectors & solder them to the HP motherboard, you're not going to get them connected.

https://www.dell.com/support/home/ca/en/cadhs1/product-support/servicetag/45y66v1/manuals

Desktop: KRySTaLoGi-PC Build Log (i7-4790K, RTX2060) Mobile: OnePlus 5T | Koodo - Unlimited Calls & Texts + 12GB Data
Laptop: Dell XPS 15 9560 (the real 15" MacBook Pro that Apple didn't make) Tablet: iPad Mini 5 | Lenovo IdeaPad Duet 10.1
Camera: Canon M6 Mark II | Canon Rebel T1i (500D) | Canon SX280 | Panasonic TS20D Music: Spotify Premium (CIRCA '08)

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21 hours ago, kirashi said:

Thanks! Looks like the smaller connector you're holding is the power switch, and the larger one is for the front panel. Both of these are proprietary, so unless you're willing to rip the wires out of the connectors & solder them to the HP motherboard, you're not going to get them connected.

https://www.dell.com/support/home/ca/en/cadhs1/product-support/servicetag/45y66v1/manuals

Is the Hp motherboard nonstandard as well?

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7 hours ago, Swordhero1 said:

Is the Hp motherboard nonstandard as well?

Most consumer HP desktop motherboards are made by Pegatron (ASUS sister company) and are pretty standard, aside from a WiFi antenna here or a slimline / slot loading DVD drive connector, depending on the desktop. I wouldn't know without seeing it myself, but I'd be much more inclined to take an HP desktop motherboard and stick it into a standard mATX or ATX case than I would putting it into a Dell case.

Desktop: KRySTaLoGi-PC Build Log (i7-4790K, RTX2060) Mobile: OnePlus 5T | Koodo - Unlimited Calls & Texts + 12GB Data
Laptop: Dell XPS 15 9560 (the real 15" MacBook Pro that Apple didn't make) Tablet: iPad Mini 5 | Lenovo IdeaPad Duet 10.1
Camera: Canon M6 Mark II | Canon Rebel T1i (500D) | Canon SX280 | Panasonic TS20D Music: Spotify Premium (CIRCA '08)

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