It's not limited to the power supply, ceramic capacitors are on basically all complex circuit boards now, and most of them will readily sing and whine. It can b

It's not limited to the power supply, ceramic capacitors are on basically all complex circuit boards now, and most of them will readily sing and whine. It can be eliminated through careful design (reducing ripple) or paying nanocents more for the caps, but as far as I can tell Lenovo doesn't give a fuck.