HP Laptop Caps Lock Blinking Codes
Updated
Ver en español · Ver em português · Русская версия
HP laptops that cannot start blink the Caps Lock (and sometimes Num Lock) light. Models from about 2015 use long + short blinks (a major.minor code like 3.2); older models blink 1 to 6 times.
How it works
Count the blinks or beeps, then open the matching table below.
Not sure? The finder above takes the code and gives the meaning.
Covers: HP Laptop, Pavilion, ENVY, OMEN, Victus, EliteBook, ProBook, ZBook.
Caps Lock blink codes - long + short (models from about 2015)
Show more
Long blinks = the category, short blinks = the error inside it: 3 long + 2 short = 3.2. With a two-colour light the long blinks are red and the short ones white. The light keeps blinking until the power is removed; the beeps (where there are any) repeat five times.
| Code | What it means | What to check |
|---|---|---|
2.2 | The main part of the BIOS (DXE) is corrupted and there is no recovery image | BIOS recovery (HP: Windows + B during start, or a recovery USB stick); at the bench reflash the BIOS chip. |
2.3 | The embedded controller asks for a key sequence (BIOS recovery) | Follow the key sequence HP shows; this is part of HP Sure Start recovery. |
2.4 | The embedded controller is checking or recovering the boot block | Wait - do not remove the power while it works. |
3.2 | BIOS did not finish memory initialisation (EC timed out) | RAM: reseat, test one known-good module; soldered RAM = board repair. |
3.3 | BIOS did not finish graphics initialisation | Graphics: try an external monitor; GPU or its power on the board. |
3.4 | Power failure on the system board (crowbar) | A rail was shut off by protection - look for a shorted rail (board-level). |
3.5 | Processor not detected | CPU or its power / socket - board-level. |
3.6 | The processor does not support a feature that is enabled | Wrong CPU for the BIOS, or a setting: update / reset the BIOS. |
4.2 | Processor over-temperature | Clean the fan and heatsink, renew the thermal paste; check the fan. |
4.3 | Ambient over-temperature | Let it cool; check the airflow. |
4.4 | Over-temperature condition | Check the cooling and the temperature sensors. |
5.2 | The embedded controller cannot find valid firmware | EC firmware damaged: BIOS / EC recovery; at the bench rewrite the EC firmware. |
5.3 | The embedded controller timed out waiting for the BIOS | BIOS recovery; board fault if it stays. |
5.4 | EC timed out waiting for BIOS to finish system board initialisation | Board-level fault (power, chipset). |
5.5 | EC restarted the laptop after it stopped responding | Lock-up: update BIOS; board fault if it repeats. |
Caps Lock / Num Lock blink codes - older models (before about 2015)
Show more
Count the blinks in one series (the Caps Lock and/or Num Lock light).
| Code | What it means | What to check |
|---|---|---|
1 | Processor (CPU) not working | CPU / board-level. |
2 | BIOS corrupted | BIOS recovery or reflash. |
3 | Memory module error | Reseat / replace the RAM. |
4 | Graphics controller not working | GPU / board-level. |
5 | General system board failure | Board-level repair. |
6 | BIOS authentication failure | BIOS recovery (HP Sure Start / signed BIOS). |
No light, no beep, no code at all?
- 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.
- 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.
- 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.
- Remove what was added last (RAM, SSD, cards) and reseat the RAM.
- Connect an external monitor: a picture there means the laptop's screen, cable or backlight - not the board.
- 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
No beeps on this page for your laptop? Many laptops beep with their BIOS maker's codes - see the BIOS beep codes (AMI, Phoenix, Insyde).
Different code, or still not starting after these checks? Post the code and the laptop model on the NoPowerFix repair forum - board-level technicians answer, and every confirmed fix improves these tables.
Ask on the NoPowerFix forumFree, private, built to keep devices alive
In 15 years at the bench we saw too many good devices go in the bin because nobody found the real fault. Our Hardware Specialist and Senior Repair Technicians built these tools so more devices get fixed instead of thrown away. If they helped you, a review helps the next person find them, and your support pays for the next fix.
> goal: Less e-waste · Greener Earth
We find the real fault before parts are replaced, so fewer working batteries, boards and devices end up as e-waste.