I've been building PCs for 25 years now and this is the first time in probably 15 of those I've been completely stumped, so any help or ideas would be extremely appreciated. I've done a tonne of reading on what seems to be this relatively common issue, and tried all the troubleshooting I could find (detailed below the specs).
I built a new PC 1 month ago with no issues - working perfectly until last night. I did get this error when I first switched it on a month ago, but that was due to me being a dummy and seating the RAM in A1/B1 instead of A2/B2. I have not had a single problem, not even a PC crash, since. I was using the EXPO Profile in BIOS prior to this problem. I'm not running any other overclocks, voltage changes etc - hadn't got around to it yet this time. The full specs are (with links to the seller for ease of reference):
Asus ROG Crosshair X670E Extreme
Crucial T700 4TB M.2 2280 NVMe PCIe 5.0 SSD (Seated in the ROG Gen-z.2 to ensure available lanes on PCIE_1)
Plus a bunch of SATA Storage Drives and a 2nd M.2 - Samsung 970 2TB in the Gen Z)
I am completely out of ideas. If any piece of hardware is stuffed I think it would have to be the motherboard or RAM... but it's extremely weird that it just suddenly wouldn't boot up after a month of constant use, excellent performance and no problems. I think it did a Windows Update last night but that's all that would have changed - and that doesn't exactly affect POSTing.
Anyone got any ideas for something I should try?
Based on the scenario you described, please refer to [Motherboard] Troubleshooting - No Power/No Boot/N o Display and test with minimal components to isolate the possible cause.
Additionally, according to your other thread, I have PM you to investigate further.
Please check the top right corner of the screen and kindly share the details requested in the PM inbox.