My computer doesn't react at all when I press the power button. No lights, no fans, no beeps, the drives don't spin up. The last shutdown was a normal one; it hasn't been turned on since then. I built ...

When you disconnect your computer’s power supply from the wall, it jumps in to save your BIOS or UEFI settings in your motherboard’s CMOS-RAM (Complementary Metal-Oxide-Semiconductor). But even the ...