How to Make a Mini PC Power On Automatically After a Power Outage

Getting a mini PC to power on automatically after the mains returns is a single BIOS setting, not a special accessory. Most small boxes ship set to stay off after a power cut, which is fine for a desktop you sit at but useless for a home server, media box, or anything that needs to come back by itself. Flip one option and the unit boots the moment electricity returns, no button press required.

Quick Answer

In the BIOS, find the setting called "Restore on AC Power Loss" or "After Power Failure" and change it from "Power Off" or "Last State" to "Power On". Save and exit. From then on, whenever mains electricity returns after an outage, the mini PC boots itself with nobody touching it.

Why This Setting Exists

When power is cut and then restored, a computer has to decide what to do. By default many machines stay off, assuming a person will switch them on. That suits a desk PC but defeats an unattended server tucked in a cupboard. The "Restore on AC Power Loss" option exists precisely so headless and remote machines can recover on their own, which is essential for anything you rely on to be running when you are not there.

Step By Step

1. Enter The BIOS

Power on the mini PC and immediately tap the BIOS key as it starts. It is usually Delete, F2, or Esc, and many machines show the correct key on the boot screen for a second. If you miss it, restart and try again.

2. Find The Power Settings

Look under a menu named Power, Advanced, Chipset, or sometimes ACPI Configuration. The exact location varies by manufacturer, so scan a couple of menus if it is not obvious. You are hunting for an option that mentions AC power loss or power failure behaviour.

3. Change The Value To Power On

The setting typically offers three choices:

1. Power Off (or Stay Off) keeps the machine off when power returns. This is the common default.
2. Last State returns the machine to whatever it was doing before the cut. If it was on, it comes back on; if it was off, it stays off.
3. Power On (or Always On) boots the machine every time mains returns, regardless of its previous state.

Set it to Power On for guaranteed auto-boot. Choose Last State instead if you want the machine to remember whether you had it on or off.

4. Save And Exit

Use the save-and-exit option, usually F10, and confirm. The mini PC will reboot. The setting is now stored in the BIOS and survives future power cuts.

5. Test It Safely

To confirm, let the machine boot fully, then switch off the wall socket for a few seconds and switch it back on. The mini PC should start on its own. Testing once now saves a nasty surprise during a real outage.

When To Pick "Last State" Instead

If you sometimes deliberately shut the machine down and do not want it springing back to life after a brief flicker, "Last State" is the smarter choice. It respects your last decision, so a unit you switched off stays off, while a unit you left running comes back. For a true always-on server, though, "Power On" is the safer bet because it recovers even if it happened to be off when power was restored.

If your current mini PC does not expose this option at all, it may be worth comparing newer models, since most modern small-form-factor boxes include it. The mini-PC range Evetech stocks covers units built for always-on home-server duty where this setting is standard.

To see which compact machines other buyers trust for unattended roles, the best-selling PCs at Evetech are a quick way to shortlist a reliable always-on box.

Frequently Asked Questions

What is the setting called exactly?

Most often "Restore on AC Power Loss" or "After Power Failure", though some boards label it "AC Recovery" or "Power On After Power Loss". They all control the same behaviour, so set whichever one you find to Power On.

My BIOS only offers Last State. Will that work?

Yes, as long as the machine was on when power was cut. "Last State" restores the previous power condition, so a running machine comes back, but one you had switched off stays off.

Will this make my mini PC restart during a brief flicker?

It can, since any return of mains triggers a boot. A small uninterruptible power supply smooths out short dips so the machine only restarts after a genuine outage.

Where in the BIOS is this option?

Usually under a Power, Advanced, or Chipset menu, sometimes within ACPI settings. The location varies by manufacturer, so check a few menus for any wording about AC power loss.

Do I need extra software for this?

No. It is a firmware setting handled entirely in the BIOS, so once you save it the machine behaves correctly with no operating-system tweaks or extra programs.