HP Laptop Won’t Turn On? Hard Reset, Blink Codes and BIOS Recovery

An HP laptop that won’t turn on almost always falls into one of three groups: completely dead, power light on with a black screen, or Caps Lock and Num Lock lights blinking on their own. HP gives you a tool for each: a hard reset, which HP lists as the first thing to try, a BIOS recovery key combination for corrupted firmware on supported models, and HP PC Hardware Diagnostics UEFI, which tests the hardware without Windows.

This guide covers HP’s own tools only. If the laptop isn’t an HP, begin with our laptop won’t turn on guide, which covers ThinkPads and general power checks; Dell owners should use the Dell power and LED code guide.

Which HP symptom do you have?

Start with an HP hard reset

HP’s own troubleshooting starts every no-power case with a hard reset. It drains leftover charge that can leave the power circuitry stuck, and it doesn’t touch your files.

1. Disconnect the laptop from any dock or port replicator, and unplug all USB devices, memory cards and external monitors.
2. Unplug the AC adapter. On models with a removable battery, remove it too.
3. Press and hold the power button for about 15 seconds.
4. Reconnect only the AC adapter, plus the battery if you removed it.
5. Press the power button to start.

If it stays dead, run the outlet, port and battery checks in our general laptop power guide, and try a known-good HP adapter with the same connector and the same or higher wattage if you have one. A fully flat battery on a small USB-C charger can take a while to respond.

Caps Lock and Num Lock blink codes

When an HP notebook finds a hardware error at startup, it often reports it as a repeating pattern of long and short blinks on the Caps Lock light. On a two-color light the long blinks are red (the main error category) and the short blinks are white (the detail); on a single-color light both are white. Some models beep as well, and some older models blink Caps Lock or Num Lock a simple number of times instead.

• Watch at least three cycles and count the long blinks and the short blinks separately in each. Don’t add them together: 3 long and 2 short is a different code from 5 blinks.
• Note which light is blinking, its color, and whether every cycle has the same pattern.
• Look up the pattern in HP’s blinking-lights document for notebook PCs, or give it to HP support with your product number.

HP’s current notebook table maps each pattern to a cause. Codes you can act on yourself:

• BIOS code (2 long, 2 short): the BIOS is corrupted and there’s no usable backup copy, so use the BIOS recovery below with a recovery USB drive (not supported on HP Sure Start business models; contact HP).
• Embedded controller codes (2 long, 3 short; 2 long, 4 short; 5 long, 2 short): unplug the adapter, hold the power button for more than 12 seconds, release, let the laptop start, then reconnect the adapter.
• Power code (3 long, 4 short): check the adapter connections and that the adapter has enough wattage for the laptop.
• Overheating codes (4 long, then 2, 3 or 4 short): shut down, unplug, let it cool for about 10 minutes and clear dust from the vents with canned air.
• Memory code (3 long, 2 short): reseat the memory only if your model has a cover for it. Unplug the adapter, remove or disconnect the battery and ground yourself first to avoid static damage. If there’s no memory cover, or the laptop is under warranty, have HP service it.

Graphics and processor codes point to a repair; for any other pattern, follow HP’s document.

Power light on, black screen

This is the “HP laptop black screen but power on” case. The laptop has power, so the question is whether the screen, the display path or the startup is failing.

1. Give it a minute. A laptop finishing an update can sit on a black screen.
2. Restart the graphics driver. Press Windows + Ctrl + Shift + B in case Windows is running behind the black screen; a beep or flicker means it is.
3. Try an external monitor. Connect one to HDMI or a USB-C port that supports video, then restart. If the HP logo appears there, the laptop itself is starting and the fault is most likely the internal screen or its display cable.
4. Do the hard reset above with only the adapter connected.
5. Tap Esc at power-on. Press the power button and tap Esc repeatedly. If the Startup Menu appears, the screen and core hardware work and the problem is later in startup. From that menu, F2 opens HP’s hardware diagnostics, F10 opens BIOS setup and F11 opens recovery options.
6. Reset the CMOS with Windows + V. On many HP consumer notebooks this returns BIOS settings to their defaults, which can clear a setting that stops startup. With the adapter connected, turn the laptop off and wait at least 5 seconds. Hold Windows + V on the laptop’s own keyboard, press and hold the power button for 2 to 3 seconds, release only the power button, and keep holding the keys until a CMOS reset screen appears or the laptop beeps. Business models (EliteBook, ProBook, ZBook) use different steps, listed in HP’s Reset the CMOS document. An encrypted drive may then ask for its BitLocker recovery key.

If neither screen shows anything and there’s no Startup Menu or blink code, try BIOS recovery next, then plan a repair diagnosis.

HP BIOS recovery with Windows + B

On many HP notebooks, a key combination tells the laptop to rebuild a corrupted BIOS from a backup copy or from a recovery USB drive. Use it after an interrupted BIOS update, or when a blink code points to the BIOS. Not every model supports it, so check your model’s support page if nothing happens. HP business laptops with HP Sure Start work differently: Sure Start repairs a corrupted BIOS automatically from a protected backup copy, so a recovery message may appear without any key presses, and HP says these models don’t support the key-press or USB recovery methods.

1. Turn the laptop off, wait 5 to 10 seconds, and connect the AC adapter. Keep it connected throughout. If you’ve made a recovery USB drive (see below), plug it in now.
2. Press and hold the Windows key and the B key together on the laptop’s own keyboard. On some models HP uses Windows + V instead; on many consumer models that combination resets the CMOS, as described in the black screen section.
3. While holding them, press and hold the power button for 2 to 3 seconds, then release only the power button.
4. Keep holding the keys until the HP BIOS Update screen appears or the laptop beeps.
5. Follow any prompts and let it finish. The laptop may restart more than once; don’t unplug it or turn it off.

If the recovery screen never appears, the laptop may have no usable backup copy. On a second computer, download the BIOS for your exact model from HP’s Software and Driver Downloads page, run it, choose Create Recovery USB flash drive, then repeat the steps above with that drive plugged into the HP. Read the download’s details to confirm it matches your model first, because HP warns that installing the wrong BIOS can stop the computer working. If the screen still doesn’t appear, HP says the model may not support this function.

Have the BitLocker recovery key ready, because firmware changes can trigger a BitLocker prompt on the next start; our guide explains where BitLocker recovery keys are stored.

Test the hardware with HP PC Hardware Diagnostics UEFI

HP PC Hardware Diagnostics UEFI runs outside the operating system, so a failure there is hardware, not Windows or an app. It’s built into many HP laptops, and if F2 doesn’t open it, HP offers it as a download you can run from a USB drive.

1. Turn the laptop off, press the power button, and immediately tap Esc about once a second until the Startup Menu appears.
2. Press F2 to open the diagnostics.
3. Choose System Tests, then Fast Test (about 4 minutes). If nothing fails but problems continue, run the Extensive Test (2 hours or more), or use Component Tests to test memory and storage individually.

A failed test gives a 24-digit failure ID. Enter it with the product number on HP’s PC Hardware Diagnostics page to start a warranty or repair case.

If every test passes but Windows still won’t load, a hardware fault is much less likely and the problem is probably Windows or the files on the drive. Our guide to fixing an automatic repair loop starts with the steps that protect your files.

For offices: be ready before the next HP won’t start

For an office running HP laptops, set these up in advance:

• Keep a list of each laptop’s product number and serial number. They’re usually on the label underneath, and on many models Fn + Esc shows them in HP System Information. HP’s warranty check and failure-ID lookup both need them.
• Keep one spare HP adapter for each wattage and connector type you use, so the first power test takes a minute instead of a day.
• Store BitLocker keys centrally, for example in Microsoft Entra ID, where an admin can retrieve them from the Entra or Intune admin center.
• Push BIOS updates only when laptops are on AC power and each laptop’s BitLocker recovery key is confirmed backed up, and suspend BitLocker for the update restart if your update tool doesn’t do it for you. Tell staff not to close the lid or unplug during one. Without HP Sure Start, an interrupted update is a common reason to need Windows + B recovery.
• Back up files from laptops to the cloud, so a hardware failure means a repair, not lost work.

When to stop and get it repaired

• No lights or response after a hard reset with a known-good adapter.
• The blink code comes back after BIOS recovery, or diagnostics produce a failure ID.
• An external monitor works but the internal screen stays black, which usually points to a screen or cable repair.
• A swollen battery: unplug the laptop, don’t charge or start it, and don’t press or puncture the battery. Leave it on a hard surface away from anything flammable, and if it’s hot, smoking or hissing, get away from it and call 911.
• Liquid damage, a burning smell or a hot spot on the base: unplug it and stop.

Run HP’s warranty check with the serial number before paying anyone, and keep the 24-digit failure ID if diagnostics gave you one. Find the BitLocker key and confirm where the files are backed up before the laptop leaves the office. A laptop that won’t power on can’t be fixed over a remote connection, so it needs HP’s repair service or a nearby repair shop. When it boots again, ask us about any Windows, driver or BitLocker problems left over; we’ll tell you plainly whether they suit remote support, where every session needs your approval and you can end it at any time.

GoPro IT is an independent IT support company and is not affiliated with HP Inc. HP warranty service is arranged through HP.

Common questions

My HP laptop won’t turn on but the charging light is on. What does that mean?

The light shows the HP is getting power, so the adapter and outlet are probably working. The usual causes are a stuck power state, a battery too drained to start, or a power button or system board fault. Do the hard reset, leave it on the HP adapter for 30 minutes, then press the power button with only the adapter connected. If the Caps Lock light starts blinking, read the code; if nothing happens at all, plan a repair diagnosis.

Why is my HP laptop’s Caps Lock light blinking?

It’s a startup diagnostic code: the laptop found a hardware problem at startup and is reporting it as a repeating pattern. On current HP models that’s a group of long blinks followed by short ones, such as 2 long, 2 short; on two-color lights the long blinks are red and the short ones white. Count both over several cycles without adding them together, then look the pattern up in HP’s notebook blinking-lights document or give it and your product number to HP support.

Why is my HP laptop on but the screen is black?

Either the internal screen isn’t showing a picture or the laptop isn’t finishing startup. Press Windows + Ctrl + Shift + B in case Windows is running, connect an external monitor, and tap Esc at power-on to see whether the Startup Menu appears. If the external monitor shows a picture, the problem is most likely the internal screen or its cable rather than the whole laptop.

What does Windows + B do on an HP laptop?

On supported HP notebooks, holding Windows + B (Windows + V on some models) while holding the power button for 2 to 3 seconds starts BIOS recovery, which rebuilds corrupted firmware from a backup copy or a recovery USB drive. Keep the adapter connected, keep holding the keys until the recovery screen appears or the laptop beeps, and let it finish without interruption. Not every HP model supports it, and business models with HP Sure Start repair a corrupted BIOS automatically instead.

Can I factory reset an HP laptop that won’t turn on?

Not until it starts far enough to show the Startup Menu, and it rarely helps. A factory reset reinstalls Windows; it can’t fix missing power, a dead screen or a failed part, and it can erase your files. A hard reset is different: it only drains leftover power and is the safe first step. If tapping Esc shows the Startup Menu, run the F2 diagnostics first, and consider the F11 recovery options only if they pass and your files are safe elsewhere.

Will a hard reset or BIOS recovery delete my files?

Neither one erases your drive: a hard reset only drains residual power, and BIOS recovery rewrites the firmware, not your files. The risk is BitLocker. If the drive is encrypted, the next start may ask for the recovery key, and without it you can’t get back into Windows or your files, so find the key before you start. Some F11 recovery options reset Windows and can remove files, so read each one carefully.