Optiplex 3090 SFF - Service Mode Jumper is Set

Thank you! We have received the required details. We will work towards a resolution. In the meantime, you may also receive assistance or suggestions from the community members.

No work was done inside the system.  It was removed from it's shipping box, placed on a workbench, connected to a monitor/kb/mouse/power.  Unlike the rest of the machines, where manual activation of the power button was necessary to power them on, the machine in question immediately powered on once the power was connected, at which time it went into the diagnostic mode with the message about the Service Mode Jumper.  

I've attached a few snaps of the motherboard.  Perhaps someone else has better eyes than I and can find the  jumper!

See this forum post and as it states 

Was any work done inside the system? Generally this should happen if the jumper is installed on both pins of the PSWD pins. The jumper should be either pulled completely or only located on one pin.

You clearly don't have it as there's no pins soldered,
The problem is either software/firmware (e.g. settings, glitch in logic, etc.)
or hardware (shortcut {e.g. dropped screw under MB}, electrical defect)

SFF Optiplex 5090 and 3090 have similar MB layout (with a bit different component mounts) but 7090 is slightly different board (closer towards Precision 3450).

Oh, and by the way, thanks Dell.  Removing the word  from my original post kind of makes it more emphatic.

Yeah, the "something shorted" was my last thought, since I'd already let the BIOS updater run for 24 hrs with no success (never got past 0%).  I'm tired of dealing with it so RMA, here I come.

I'm having an issue with a work machine that seems to have the same pinout to the mobo in this thread. My issue is that I'm looking for a bios admin password reset jumper (or one that is similar enough that it could achieve the same goal), and there are none on my machine. Although my machine has the HD34C motherboard, it has the same RZ0624 chipset. Additionally, it looks visibly similar to the motherboard in the above images, minus the differing mobo number.

My mobo is also missing all of the jumper pins, so I'm just looking to see if anyone knows the functions of these three sets of pins. You have obviously mentioned that the set on the left of the bank of three (from the prespective of the prior image) is the service mode jumper. Including the one on the far left that is removed from the set of three, what are the functions of each of these jumpers? Any and all replies are welcomed and appriciated.

It's been 9 months ago, I can't remember anymore unfortunately, but knowing what pins those would be - is hardly helping since many other surface-mounted components connected to those placeholders are missing too, therefore even shorting bare board won't do anything.
As for password-reset jumper location - for most customer boards it's normally one of nearest to BIOS microcontroller (similarly to "clear cmos" jumper).
Have you tried removing battery for some time (with power cord disconnected), e.g. 5 minutes ?

I do understand the significant span of time since then, though I furthermore appreciate your response all the greater. Yes, it was the first instinct to remove the cmos battery (with power disconnected), then to let it sit for an extended period of time. Tragically, it appears that the password may be stored in non-volatile memory. I submitted this on behalf of a collogue, so I will pass on the information, and hopefully we may be able to find a solution, even if temporary.

Thank you for the response!

I hardly deal with these sort of reset issues, therefore might not offer much of advice.
There must be much simpler option than the path below.
As far as I know they're using DEC1515 microcontroller from Microchip closest similarity I found is MEC1521 controller (technical document I think is labeled as DS00003427E by manufacturer) in VTQFP/Z2 package , but simple pinout (pages 15 to 20 of document) is kind of unlikely to be of any use since it's configurable and therefore any bit {or combination} can be used for CLR_PWD function.

in recent models Dell oem motherboard has retired clr cmos and pass wd jumper options. 

Dell official doc "The legacy jumper that enabled a hardware-based RTC reset has been retired on these models."

"Dell desktop computers launched prior to this document have a motherboard jumper-based reset function. If your product was shipped prior to April 2020 and is not listed above, then the computer will most likely have a jumper-based reset." 

3090 sff was released July 2022.

3090 sff service manual mentions "To clear the system or BIOS passwords, contact Dell technical support as described at www.dell.com/contactdell."

Alright, thank you. If we are lucky, the impacted machines will be replaced before bios access is needed. If not, then I will further research the microcontroller. If a reasonably quick solution does not turn out after looking into it, and we need access to the bios, then I will contact dell through official support channels, likely available through my company, as we did purchase all of the machines from them.

Thank you again.