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February 25th, 2026 12:36
Aurora R12, no post boot, no video
Hi everyone... this just turned up yesterday. My R12 shutdown while playing BF6 and now will light up for a second on the front lights not the power button then click off seconds later. I have had this PC for four plus years with no issues. I upgraded over the years to the OEM Dell liquid cooling, Dell OEM 1000 watt power supply, Dell VRM heating and a OEM GTX 4070. Machine has been running fine for months with this video card. Temps on CPU and GPU were not hot as I closely monitored them. I have done this so far... pushed the power supply test button and it lights up and fans spin if held in. Reset video card and motherboard connectors, replace CMOS battery and also reset CMOS jumper and did the 30 second hold the power button trick. None of these worked. So in short no video at all and PC does not post boot only those lights in front turn on then clicks off and continues this sequence with no sound coming from fans or power supply. Im guessing motherboard??
DELL-Daniel V
Community Manager
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538 Posts
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February 25th, 2026 16:43
Contact Dell GHN (Get Help Now) chat technical support Monday through Friday. Click the blue "Get Help Now" on the right to start a private live chat session. Share the private Service Tag with them so that they can verify the ownership and warranty status. This will also generate a unique Technical Support case for your unique Service Tag. If already out of warranty, click here for the Dell out of warranty offerings.
It does sound like a motherboard issue given the steps you've tried out and the PSU BIST is passing. That said, I would bring the unit down to minimum to post to see if you get any other signs of life. So that would entail fully removing the GPU, SSD, and RAM. With the parts removed, you'll then want to turn it back on to see if the power LED is flashing any diagnostic codes. A responsive motherboard should be 2 flashes at the power LED since it'll have no memory. If you get that, then I'd reinstall the parts one at a time to see what may be causing a short, if any. If you don't get that memory error, then motherboard would seem to be the way to go.
Tesla1856
10 Wizard
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February 26th, 2026 03:02
I agree with @DELL-Daniel V and the "simplification" of the system for troubleshooting, however, I don't usually go to those extremes.
Have your tried only connecting wired USB keyboard and mouse, and then also the monitor. Remove any USB dongles and any optional Add-In PCIe cards.
Does that system have on-board video you never use? If so, now would be a good time to remove the video-card and try to use it.
Remember to always dissipate the flea-power after it's been on, and you are getting inside again.
(edited)
bradthetechnut
9 Technologist
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40.6K Points
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February 26th, 2026 04:29
A PSU on its way out can still spin the fans with the test button pushed. Does it turn on if you press PSU and power buttons at the same time?
I agree with both Tesla and Daniel for troubleshooting. Use Tesla's simpler method first, then Daniel's second.
Kind of rare MB goes out. I'm leaning toward the PSU.
Tesla1856
10 Wizard
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71.4K Points
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February 26th, 2026 04:41
@bradthetechnut ,
1. AFAIK, the "Test button" is just a Dell thing and I can never really remember what the dead machine is suppose to do when you press it.
When the need arises, I just test my PC-Power Supplies (SMPS) with a Digital PC-Power-Supply Tester.
2. Agreed (unless there was the occurrence of an "unusual event").
DELL-Daniel V
Community Manager
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538 Posts
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2.8K Points
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February 26th, 2026 14:33
@Tesla1856
Our PSU's have 1 of 2 possible built in self tests. There is a button BIST and a buttonless BIST. In this instance with the R12, we should have a button BIST. Here is one of our articles outlining the steps and results of testing the PSU with each version:
Power Supply Unit Built-in Self-Test (PSU BIST)
The article says its for our newer Dell pro models but really it applies to all of our PSUs!