The mains flicker back on after an outage, every other device in the house wakes up, and the mini PC just sits there dark. Before you fear a dead unit, know this: a mini PC that won't turn on after a power cut is almost always obeying a single BIOS setting, not suffering a hardware fault. Flip that setting and the machine boots itself the moment power returns.

Quick Answer

A mini PC staying dark after the power comes back is nearly always set to the default "Power Off" state on AC loss in its BIOS, not broken. Enter the BIOS, find the AC power recovery setting, change it from "Stay Off" or "Last State" to "Power On", save and exit. The unit will then boot automatically after future outages.

Why It Stays Off

Most mini PCs ship with their BIOS set to remain off when mains power is restored after an interruption. This is a deliberate default, meant to stop a machine waking unexpectedly, but it is the wrong choice for a unit you want running unattended, like a media server or a small always-on box. The setting governs exactly one thing: what the machine does the instant AC power returns. With it on the default, the answer is nothing, so the Pi-sized server you rely on simply waits for you to walk over and press the button. That is the behaviour, not a fault, and it is a two-minute fix.

The Fix, Step By Step

The setting lives in the BIOS, and reaching it takes a minute.

  1. With the mini PC off, power it on and immediately tap the BIOS entry key. It is usually Delete, F2, F1, F10 or Escape, depending on the maker. If one does not work, restart and try another.
  2. Inside the BIOS, look under a menu named Advanced, Power Management or ACPI. The wording varies by manufacturer.
  3. Find the setting labelled something like "Restore on AC Power Loss", "AC Power Recovery", "After Power Failure" or "State After Power Loss".
  4. Change it from "Stay Off" or "Last State" to "Power On" or "Always On".
  5. Press the save-and-exit key, normally F10, and confirm. The machine reboots.

That is the whole fix. Next time the power drops and returns, the unit boots on its own.

When It Still Won't Wake

If you have set "Power On" and the mini PC still stays dark after an outage, one quirk affects some units. A power supply protection feature can detect the surge as power returns and shut itself into a protective state, so the motherboard never sees a clean power signal. In that case you may need to flick the physical power switch on the supply off and on, or unplug and replug it, to reset it before the auto-boot works. It is uncommon, but worth knowing before assuming the board is faulty. If the machine genuinely shows no sign of life even with power confirmed at the wall, the mini PC range at Evetech is where to look for a replacement or an upgrade with more reliable power behaviour.

Frequently Asked Questions

Is my mini PC broken if it won't turn on after a power cut?

Almost certainly not. The usual cause is the BIOS being set to stay off when AC power returns, which is a default setting rather than a fault. Changing it to power on after power loss fixes the behaviour.

What is the BIOS setting actually called?

It varies by manufacturer but reads as something like "Restore on AC Power Loss", "AC Power Recovery", "After Power Failure" or "State After Power Loss". Set it to "Power On" or "Always On" rather than "Stay Off" or "Last State".

How do I get into my mini PC's BIOS?

Power the unit on and immediately tap the entry key, commonly Delete, F2, F1, F10 or Escape. The exact key depends on the maker, so if one does not work, restart and try another.

It still won't auto-boot after I changed the setting. Why?

Some power supplies enter a protective state after detecting the surge when power returns, so the board never sees a clean signal. Flicking the supply's physical switch off and on, or unplugging and replugging it, often resets it so auto-boot works. If you are weighing a replacement, the best-selling PCs at Evetech highlights compact options from reliable brands with consistent power-recovery behaviour.

Need a compact machine that handles power interruptions reliably? Browse the mini PCs at Evetech and find a unit built to boot back up the moment power returns.