Device fails to power up.
Device fails to power up.
Hi there, I'm trying to understand something confusing. My PC has shut down completely and now pressing the power button doesn't work. I'm not sure if the problem is with the motherboard or the power supply unit. The motherboard I have is an Asus ROG Strix Z690 A gaming board, and it still shows power on. The PSU is a Corsair RM850X, which spins nicely when connected to a Dr. Power II universal ATX power tester. I've even tried using a screwdriver on the power connectors to see if it would work, but it hasn't helped. Anyone have any ideas how to fix this?
Initial checks: confirm the device is powered. It might seem simple, but the power source could be off, or a breaker might have tripped. The power supply itself may be disconnected, interrupting the entire path to the PSU. If everything looks fine there, proceed to inspect the connection from the PSU to the motherboard. Should that pass, examine the PSU next. Once these steps are done, you might need to invest in repairs.
What power rating and voltage are you observing with the Dr. Power II? This is important since if it's below 850 it might signal an issue. A reading around 820 could simply mean age, but anything under 800 should prompt a replacement check. There might also be a short circuit or a problem with your motherboard; verify if the power supply shuts down due to overcurrent. If that happens, the affected part—possibly the motherboard, RAM, or graphics card—may have failed. To troubleshoot, remove all components except the CPU and connect only the 24-pin connector plus one fan. If the fan spins and lights appear, test with a single RAM stick, then proceed step by step until you find the faulty component. Also, power surges or outages could damage the board or processor; using quality surge protectors is essential.
When removing the 24-pin ATX cable from the motherboard and connecting it to the Dr. Power II, you can view the referenced values such as 820 by checking the motherboard's BIOS settings or using a monitoring tool. I’ll try all the suggestions you’ve given and keep you updated.
This appears to be a reference to a different type of power supply or measurement device, possibly a replacement for a PSU or a high-end multimeter. The mention of lights in the first post suggests it might relate to lighting equipment, but the context shifts elsewhere.
Everything appears to be in order. I verified the PG value and confirmed it falls within the acceptable range: https://en.wikipedia.org/wiki/Power_good_signal. The 24-pin connector looks correct, so now I’m looking for any short circuits in the remaining wires. This could indicate an issue with the motherboard or CPU. The next step I’d recommend is checking the power supply tester they provide: https://www.asus.com/us/support/FAQ/1040820/. You can also find the manual here: https://file.thermaltake.com/file/qig/Dr...Guide).pdf
Do you need a precise diagnosis? It seems the system doesn't power on at all. You might want to check some components listed in your notes and attempt to boot every time you make changes. Clear the CMOS, reset the RAM, or try using only one stick of memory with different slots. Unplug all unnecessary wires, remove the GPU and test a replacement, reseat the CPU if possible, switch the power supply, or replace the motherboard if needed.