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Laptop error codes - blinking lights, beeps and Caps Lock codes

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Laptop won't start, but a light blinks, it beeps, or a code shows on the screen? Pick the maker, type the code or pattern, and see what it means and what to check - from the makers' own service documents, explained by repair technicians.

How it works

Pick the maker, then count the blinks or beeps.

Amber first, then white. Long first, then short. Film it with your phone to count.

Find your laptop code

Or pick the maker to see all its codes.

How to count a blink or beep code

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  • Two colours (Dell, newer Lenovo): count the first colour (amber), then the second (white): 2 amber + 3 white = 2,3. Saw the white blinks first? The code still starts with amber: 3 white then 2 amber is 2,3, not 3,2.
  • Long and short (HP Caps Lock): long blinks first, short blinks after: 3 long + 2 short = 3.2.
  • Beep groups (Phoenix, older ThinkPads): beeps between pauses: one, pause, three, pause, three, pause, one = 1-3-3-1.
  • Film it with your phone - counting is much easier when you can play it back slowly.

Codes by laptop maker

DellHPLenovoApple MacBookMicrosoft SurfaceASUSAcerMSISamsungToshiba / DynabookFrameworkHuaweiXiaomi / RedmiLG gramRazerFujitsuChromebookBIOS beep codes (AMI, Phoenix, Insyde)

No light, no beep, no code at all?

  1. Look at the charger's own light. Off = charger, cable or outlet. If it blinks or goes out the moment you plug it into the laptop, there is a short circuit inside the laptop - unplug it.
  2. Power reset (EC reset): charger out (and the battery if it comes out), hold the power button 30 seconds, then plug in and try again. Laptops with a built-in battery often have a small reset hole underneath.
  3. Charge it for 30 minutes with the original charger: a deeply empty battery - or a new laptop in shipping mode - will not start at once.
  4. Remove what was added last (RAM, SSD, cards) and reseat the RAM.
  5. Connect an external monitor: a picture there means the laptop's screen, cable or backlight - not the board.
  6. Still dead: it is a board-level fault - charger chip, a shorted power rail, or the BIOS chip. A repair technician measures the rails in their power-on order.

Step-by-step: the no-power troubleshooter

Your code is not listed? Post it with the laptop model on the NoPowerFix repair forum - board-level technicians answer, and confirmed fixes are added here.

Ask on the NoPowerFix forum

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