XPS 8940, power light flashing yellow 3, white 2

It indicates PCI of Video card/chip failure 

Since it's 5 months old, warranty would cover it, you can try Removing power cable from Tower and holding the power button down for 30 seconds to release static charge and than powering it on again

If no go please remove the monitor from graphic card and plug it to the Motherboard, 

do not play with any internal components and call Dell warranty for Motherboard replacement. 

@yarrumbak When posting a question about a PC it would help to post information about the model number and configuration (hard drives, graphics card, memory, etc.).

@yarrumbak 

S5 VID 3, 2
3 blinks followed by a short pause, 2 blinks, long pause, then repeats

Video subsystem configuration activity in progress or video subsystem failure.

 Troubleshoot, narrow down the issue by removing cards one by one to determine which card failed.

Oh yeah, sorry. The specs are:

Thanks, I'll check these out in the morning.

@yarrumbak Based on the spec, I assume your PC is an XPS 8940. According to the Service Manual, see page 73, a diagnostic light code (amber, white) of 3.2 indicates PCI of Video card/chip failure. You can as @speedstep suggested and remove the video card and connect your monitor to the integrated graphics, but as @XPS_Man suggests perhaps you should conduct Dell since your PC is still under warranty.

@yarrumbak   - Agree with @Vic384 since you should still be under warranty. Contact Dell Tech Support and let them fix it. Have your Service Tag available....

@yarrumbak 

Send Private Message PM to @DELL-Cares 

with your service tag and include the problem description.

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I too have a brand new XPS MT 8940 with same issue.  Waiting 2 weeks for "replacement" mother board!  I not happy, as I believe that the issue may have an issue with the underpowered PSU.  I wanted to upgrade to that at time of purchase, but they seemed to none available and build would have taken for ever.  Not a very happy Dell customer who has purchased well over 10 personal computers from dell over the years.  I hope that this is not going to be an ongoing issue. 

My Config:

• 11th Gen Intel(R) Core(TM) i7-11700K processor (8-Core, 16M Cache, 3.6GHz to 5.0GHz)
  NVIDIA(R) GeForce(R) GTX 1660 SUPER(TM) 6GB GDDR6
  360W Night Sky Bezel Chassis including optical drive
  Windows 10 Home English
  16GB, 2x8GB, DDR4, 2933Mhz
  512GB M.2 PCIe NVMe Solid State Drive + 2TB 7200RPM Hard Drive
  I also have dual monitors set up. Both are HP monitors.

I've just had this issue and contacted Dell Support.

They did remote assist and performed a complete update of drivers and firmware (all as of this date, 22/03/2022).

After rebooting and a repower, everything has now settled to normal operation.

None of the comments above (or below, whatever) had the answer. This is the answer.

Dell provided great support and came to the party and fixed the problem.

All going 100% (the system was going 100%, just had the 3/2 LED issue).

You could do the update yourself, using the Dell Assistant in Windows.

I hope that helps.

Oh, I have to eat my words.. later the next day, the 3,2 pattern has returned.

Hmmm.. I've reported it to Dell, will wait to see what's next.

Thanks for the update. Sorry the problem has returned. 

IIRC, somebody did get the motherboard replaced to fix the problem....

I bought a brand new Dell XPS 8940 in 2021 that was delivered in September 2021. About 2 days after initial startup, the 3 amber/2 white code appeared. We went through all the remote troubleshooting with Dell when it was decided the graphics card needed replaced. A service tech replaced the graphics card. Two days later, the same code appeared. A service tech came out and replaced the motherboard and graphics card. A couple days later the same code appeared AGAIN. Dell decided to replace the motherboard again. The replacement motherboard was faulty and PC wouldn't boot correctly. It was decided that the PC needed to be sent to the service center to go through the entire PC. I reiterated all the issues that have happened since DAY ONE of the PC arriving, but that wasn't taken into consideration. They just replaced the motherboard again, booted it up once, and signed off. The PC was just returned last night, and I kid you not, I turned the PC on, restarted right away, and the same light code appeared again. I'm asking Dell for a brand new replacement PC.

Update on this - Dell finally got back to me about a replacement. They want to send me a refurbished unit because it's "out of the window of replacement" even though I sent e-mails to the customer care team less than a month after initial delivery of the PC to get a new unit because the service tech recommended I do so after the first repair. The customer care team never responded after several e-mails reaching out to them in Oct 2021. I suspect they were trying to delay response so the unit would be out of the replacement window. This is enough for me to stop shopping with Dell.

I'm getting the same error code as of 06/02/2022, and I purchased my 8940 back in December 2021.  The code went away when I plugged into the iGPU.  Did Dell ever get you sorted out?  I really don't want a refurb.