Notices by Stephanie Loves to Make (stephlahs@mastodon.social)

@foone
The most common failures are power supply and ram, followed by CPU, and finally motherboard. Motherboard failures are typically damaged components.
A damaged power supply would have a similar signature to what you're seeing. Damaged motherboard typically results in the board not booting at all (you'd never make it to a login screen). Same with CPU.
(I spent years repairing motherboard engineering samples)