No visual output, no USB connection, power switch malfunction detected.
No visual output, no USB connection, power switch malfunction detected.
I recently restarted my PC for maintenance (mainly for playing Civ and modded Minecraft) and noticed several issues. It appears to have some problems, but I'm not sure what's causing them. I attempted to set it up using a KVM before switching off, but whenever I plugged it in through the GPU or motherboard, it wouldn't display anything—just a "no signal" message. The USB connection also failed; my main keyboard and mouse don’t light up, though an older mouse does. Additionally, the power button doesn’t shut it down normally—it only works via the power supply switch. The motherboard isn’t emitting any beep codes. I’ve tried several troubleshooting steps from the guide: booting without a GPU, using just one stick of RAM, connecting directly to the monitor, changing the CMOS battery, and removing/reinserting it. Still, nothing shows up on the BIOS and the keyboard won’t connect. Everything seems fine except for the power button and display output. Any advice on how to resolve these problems would be appreciated.