New installation requires disconnection of power supply before turning on the system
New installation requires disconnection of power supply before turning on the system
You've tried several troubleshooting steps and still face boot issues with your new build. The problem seems to stem from CMOS-related concerns, as disconnecting/reconnecting the power supply prevents fans and LEDs from working. Even after resetting the CMOS battery temporarily, the system doesn't boot properly. Since you've confirmed no extra components are present and the BIOS update didn't help, it likely points to a faulty motherboard or a deeper hardware issue.
Disconnecting the CMOS battery clears the CMOS settings that store BIOS changes. It seems the system is getting corrupted. I’d consider re-flashing the CMOS just in case, though I’m not sure if it will help. The issue could stem from hardware or software, so an OS reinstall might be worth trying.
I'll attempt to refresh the CMOS and check if that resolves the problem. Concerning the operating system software, this occurred prior to installation. Initially, the PC wouldn't boot after assembly, so I removed the battery to clear the CMOS and it started working. After finishing the build, I cleared the CMOS again and the system booted successfully. Then I moved the PC to a different location and it failed to start once more. My suspicion is that powering off the battery while the CMOS is active may be corrupting the memory.
You’ve already handled that, haven’t you? You do this each time you pull the battery. The bios are reset to their default settings. It seems something is messing with them every time you run something, or maybe they’re inherently corrupt from the start. Re-flashing the bios—even if it’s the same version again—would fix any issues created during the flash. Just like redownloading offers a fresh start for download errors. It might come from another source, but that’s the approach I’d take first because it’s likely, quick, non-destructive, and affordable.
I might swap out the motherboard. If it starts up at all, you can be sure the rest are fine. Because you built it on a breadboard outside the case, there’s no direct connection to the case itself. You could attempt a BIOS flash or change the battery. Also, try shutting off the PSU, holding the power button for ten seconds, and see if it boots afterward (to discharge capacitors). I’m skeptical these steps will help.