Assist with the PC not posting issue. Please help resolve it.
Assist with the PC not posting issue. Please help resolve it.
Hey, I’ve already checked the pinned thread about PCs not turning on. Here’s what I’ve tried so far: a RTX 3060 Ti with Ryzen 7 5700X, CPU B450 Tomahawk MAX, M.2 NVMe SSD with DeepCool 550W PSU, Corsair Vengance 1x32GB at 3200MHz RAM (in the debug slot per the manual). I live in a small town and have already taken it in, but they couldn’t spot anything.
In my area we have scheduled power cuts for two hours at a time. The PC is connected to a multi-plug with a surge protector on the wall, plus a generator for some outages. After a planned blackout (the PC stays plugged into the surge protector when it drops), it won’t start.
I’ve tested different CPUs, swapped in RAM, updated CMOS, changed power supplies, unplugged peripherals, and even turned it off before the cuts. The only thing that helped at first was reseating the CPU. Rebuilding the whole rig worked a few times but was time-consuming.
I ran a powerclip test on the PSU, shorted the CMOS and replaced it, checked the power button with a screwdriver on the motherboard, left the board in the case overnight to see if that caused an issue, rewired the standoffs and backpanel, inspected for cracks, removed peripherals and waited 30 minutes, and even tried removing the HDMI port (could it drain CMOS or cause a short?).
It’s frustrating because I can’t pinpoint the problem. The repair shop couldn’t help either since they couldn’t reproduce it. Usually, leaving it plugged in and letting it run for about an hour after a cut will get it back online. It’s not a total failure but it’s really stressing me out.
Feel free to ask questions, and if you want, I can send some screenshots. Thanks a lot for your patience and support!
You're asking about what happens when a PC says it won't post. It can seem confusing—like lights flickering, fans whirring, or the system just stopping. Sometimes it works again after a reboot, and other times it doesn't respond at all. The issue might be temporary or related to power stability.
No illumination or cooling, just silence. A power cut happened and my computer hasn’t booted since the electricity returned. The usual fixes don’t help—it sometimes works but only if it’s off for less than two hours. If it starts again now, as long as it stays on, it should function properly. Anything longer than two hours causes it to fail.
It seems there might be a power supply issue. Ensure all connections are secure and check the PSU wires for any damage. Also, verify the connectors on the MOBO. If problems persist, consider replacing the PSU. What model do you have? My suspicion is that you didn’t fully turn off the PSU or shut down your PC properly—power might still be active during a cut, which could affect BIOS or other components. I’m not sure if this is correct, but I hope it helps!
Replaced a 500W PSU with a 10-year-old unit and the PC started up right away. It seems the forced shutdowns during outages might have harmed the PSU, but I’m still confused about why it sometimes works and other times it doesn’t. I thought Mobo or the PSU would be completely broken, but there’s usually no middle ground. Thanks!
It seems to vary based on the configuration (Windows or BIOS). When I press the button, the computer powers off completely.
Sometimes turning off a device can cause harm, even if it wasn’t completely damaged. Restarting it and using the PC might have only made things worse. Thankfully, I was able to assist!