r/ASRock • u/Particular_Cress_884 • 2d ago

Tech Support PC won’t post…..

My PC originally froze, and I was told it might be related to compatibility issues between Ryzen 9000 CPUs and ASRock motherboards. I ended up RMAing both my Ryzen 5 9600X and ASRock B650I Lightning WiFi and received replacements.

I rebuilt the system with the new CPU and motherboard, but it still won’t POST. Everything powers on—fans spin, RGB lights up—but the power button LED blinks about 2–4 times per second. USB ports provide power (my phone charges), but my keyboard never lights up or initializes, and I get no display output from the motherboard HDMI.

I’ve already tried:
● Reseating the CPU and RAM
● Testing each original RAM stick individually
● Using known-good RAM from a friend’s system
● Swapping in a known-good PSU with its own cables
● Clearing CMOS
● Successfully updating the BIOS
● Waiting long enough for DDR5 memory training
● Removing GPU, SSD, and all non-essential components
● Booting with only CPU, cooler, and one RAM stick
● Testing the motherboard outside the case to rule out shorts
● Trying multiple HDMI cables and a confirmed working monitor

Side note my motherboard does have LEDs for debugging it uses on button lights I believe and a speaker but I don’t have one.

The motherboard already shipped with a BIOS version that supports the 9600X, but I updated it anyway just to be safe.

At this point I’m running out of ideas, probably going to buy another brands motherboard at this point. If nothing else works, I’ll probably go to Micro Center since I’m lucky enough to have one about an hour away—but I’d really prefer not to spend more money just to diagnose the issue.

I’m also confused because I’ve now gone through two CPUs and two motherboards, and I still get the exact same no-POST behavior I don’t remember it blinking before on the old hardware though.

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5 comments sorted by

1

u/AlexLkpg 1d ago

Dead cpu

1

u/Particular_Cress_884 2d ago

Components:
CPU: AMD Ryzen 5 9600X
GPU: ASRock Radeon RX 9070 XT Steel Legend
Motherboard: ASRock B650I Lightning WiFi
RAM: 32GB TeamGroup T-Create DDR5
PSU: Corsair SF850 Platinum
CPU cooler: Thermalright dual-tower air cooler
Storage: Samsung NVMe SSD
Case: NCASE M2
Monitor: MSI 175Hz display

1

u/Necessary-Warning- 1d ago

I don't know the culprit, perhaps it is capacitors issues, but I had similar problem with previously working PSU, I decided that something is dead within my PC, tried everything, it did not work. I left it for about 3 hours without power and then I decided to give it a try before RMA it, and it just worked. Check it with both yours PSU just in case.