Member Avatar for MpG

Hello,something weird happened a few minutes back.I think I turned on my pc accidentally by pressing something on the keyboard.Is this possible or it was a random event?I tried pressing a power button on my keyboard but it works only for shutdown.Any ideas? :?:

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Dani AI

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Quick answer: was right to point at the BIOS, and ’s experience is common — the BIOS option can exist but still not power the machine unless the motherboard, PSU and keyboard are the kinds the BIOS expects. Many modern BIOSes only support PS/2 keyboards for “power on by keyboard” and do not provide USB power in the fully-off (S5) state unless the board explicitly supports USB wake-from-S5. (asus.com)

Practical checklist (try in order):

  • Use a PS/2 keyboard (direct to the rear PS/2 port). If your keyboard is USB, look in BIOS for a specific “USB keyboard / USB wake from S5” or similar option — some vendors do expose that, but it is not guaranteed. (manualzilla.com)
  • Check ErP/EuP or “Platform Power/ErP Support” in BIOS: when ErP is enabled the firmware intentionally cuts standby power and will disable “power on by keyboard/mouse” and Wake-on-LAN. If ErP is on, switch it off. ()
  • Ensure the PSU supplies adequate +5VSB standby current. Some boards require a minimum +5VSB current before PS/2 or mouse/keyboard wake will work. If the PSU is very old or weak, the feature can silently fail. (mcgrp.ru)
  • Avoid wireless or hubed receivers for this test — plug the keyboard straight into the motherboard (no hub, no front-panel USB). If the BIOS offers an “Any key / Spacebar / Password” option for power on, try a simple choice first but beware accidental wake-ups. (mcgrp.ru)

If you need to debug wake events from Windows (sleep/hibernate) use the built-in tools: powercfg /lastwake and powercfg /devicequery wake_armed, and check Device Manager Power Management tabs. Those help with sleep/hibernate but won’t enable turn‑on-from-cold if the firmware/PSU won’t supply standby power. (learn.microsoft.com)

If none of the above helps, update the motherboard BIOS, try a different (preferably PS/2) keyboard or consult the board manual/support — or use alternatives such as Wake-on-LAN or RTC alarm wake.

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Member Avatar for BinaryMayhem

check your bios(F1, DEL at bootup)... there is a settings in there that control what button if any can power on your keyboard. in the bios you can specify a special button, or just use the normal ones. also if you have the keyboard software running (check your system tray) you prolly can specify the actions of the enhanced keys...

Member Avatar for MpG

Well, I checked it and there is a power on function which it is swithed to "power on by hot key" and as hot key the combination "Ctrl-F1" is selected.I turned off pc and pressed Ctrl-F1 but nothing happened.I tried all combinations of these buttons(simultaneously,CTRL-F1,F1-CTRL)and nothing happens.Did I do something wrong?I can always turn pc on by the classic switch but I want to achive the "easy" way too...!

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