iFixit - Answers With Device "HP EliteBook 800 Series"

HP EliteBook 840 G3: Why is my laptop not charging even though it says it's plugin

Fri, 14 Aug 2026 01:54:58 -0700

I have a problem with my laptop it's not charging even though it's says "plugin" the percentage is not increasing the worse is that it's draining while it's already plugin. Now I can't turn on it anymore 'cause it's drain like 0% already nothing working the fan not working, led light is not glowing etc just ded. I already did basic trouble shooting like pressing the power button for 30-60 sec still not opening, already remove the battery still not working idk anymore I really need help I need this for my capstone. Mb for my weak english.

⟐ Answer edited August 14, 2026 at 1:54 MST

HP EliteBook 850 G3: I upgrade ram 8 to 16 dual canal then black screen no booting

Wed, 12 Aug 2026 22:46:22 -0700

Black screen

HP EliteBook 840 G2: Why my laptop keeps shutting down despite having power in battery

Fri, 07 Aug 2026 01:46:08 -0700

I accidentally allowed foam cleaner to access the inside cover of my hp elite book 840 g2 and afterwards the battery has been behaving really awkwardly. every time i power it on without the AC adapter, it does not completely come on. it shuts down before completion of the power on process with a click sound . but whenever i use the adapter, there ain't such a problem. this happened immediately after exposure to the foam cleaner and has been the same ever since. i believe the motherboard is the one that was affected as it was close to the ventilation regions at the time of exposure. how should i go about this. please help.

⟐ Commented August 07, 2026 at 1:46 MST

HP Elitebook 840 G1: Battery won't charge

Mon, 03 Aug 2026 01:40:54 -0700

I wrongly connected wires of PC charger , it gave a message and shutdown (I don't remember )

Ever since then it has not been able to charge laptop battery

But when I put the same battery on another PC it charged

Any possible fix to this pc

⟐ Commented August 03, 2026 at 1:40 MST

HP EliteBook 850 G8: HP EliteBook 850 G8 won't boot after RAM upgrade boot loop

Wed, 29 Jul 2026 05:18:53 -0700

Upgraded RAM on an HP EliteBook 850 G8. Now the laptop won't boot even with the original RAM stick. Symptoms: power button, Caps Lock, and Powerbutton light up, fan spins up then stops, short cooldown with the power LED blinking amber/yellow, then it loops. Tried: Win+B BIOS recovery, full CMOS/RTC battery reset with a 60-second power button drain, testing with single original RAM stick, and running on battery power alone. Caps Lock light stopped blinking after Win+B, but the power LED amber/white-yellow loop persists.

HP EliteBook 840 G6: Laptop not turning on but toggle keys blink 5 times any fan is loud.

Mon, 27 Jul 2026 03:30:47 -0700

My laptop won't turn on. It can charge and retain power. When I press the on button, the key board lights up for a second then keys like caps lock light blink five times. The fan is also very loud and you can feel the air being expelled

⟐ Commented July 27, 2026 at 3:30 MST

HP EliteBook 840 G6: Finger print sensor not working

Sat, 18 Jul 2026 04:54:17 -0700

It says " we couldn't find a fingerprint scanner compatible with Windows Hello Fingerprint "

And i don't know how to fix it. Please help me.

⟐ Commented July 18, 2026 at 4:54 MST

HP Elitebook 840 G1: My HP 840 turns on but after 1-2 seconds turns off.

Wed, 15 Jul 2026 01:03:11 -0700

My HP 840 turns on with the HP logo and Bios but after 1-2 seconds turns off.

Not reacting on any buttons combinations. Turns on only if I connect the power adapter.

Tried to change the battery but not helped.

Please help.

⟐ Commented July 15, 2026 at 1:03 MST

HP EliteBook 840 G4: HP EliteBook 840 G4 - Power button light on but no boot/POST after BIOS reprogram

Wed, 08 Jul 2026 11:43:29 -0700

I'm troubleshooting an HP EliteBook 840 G4 that is effectively 'dead' with only the power button LED lighting up when pressed.

I have already performed the following troubleshooting steps without success:

1. Hard Reset (Drained power for 60 seconds with battery/AC disconnected).

2. Tested with AC adapter only (internal battery disconnected).

3. Reprogrammed the BIOS (flashed known good firmware).

4. Isolated components (disconnected SSD, Wi-Fi, and secondary boards).

5. Attempted boot with CMOS/RTC battery disconnected.

The laptop shows NO blinking patterns on the Caps Lock/Num Lock keys and there is NO fan spin or display activity. Since the BIOS reprogram and basic isolation didn't work, I suspect a power rail failure on the motherboard.

Are there specific voltage rails (3.3V/5V/CPU_VCORE) or power management ICs (PMIC) known to fail on this model? Any advice on board-level measurements to take next would be greatly appreciated.

⟐ Commented July 08, 2026 at 11:43 MST

HP EliteBook 840 G3: No display, with fan running at top speed

Sun, 28 Jun 2026 07:27:37 -0700

When I start or plug inthe laptop the lights turn on with no display. After that the CAPS and NUMS lock blinks exactly 5 time and then the fan runs at top speed. I have tried the bios reupdate, cleaned the rams and SSD. I even tried to change these and removed the cell on the mother board with 30 secs of pressing power button

⟐ Commented June 28, 2026 at 7:27 MST

HP EliteBook 840 G5: Laptop will only initiate boot while screen is in the down position, a

Mon, 22 Jun 2026 01:40:27 -0700

Only initiates book with the screen closed, when opened, everything goes off

⟐ Commented June 22, 2026 at 1:40 MST

HP EliteBook 840 G2: Laptop Automatically Turns On and Won’t Stay Shut Down

Fri, 19 Jun 2026 19:22:02 -0700

My laptop keeps turning on by itself even when I don’t press the power button. As soon as I connect the charger or insert the battery, it automatically powers on. Even if I shut it down, it starts running again by itself. What could be causing this issue, and how can I fix it?

⟐ Answer edited June 19, 2026 at 19:22 MST

HP EliteBook 840 G3: What is the maximum RAM for HP EliteBook 840 G3?

Thu, 18 Jun 2026 20:24:26 -0700

I have seen specs with 16 GB but also with 32 GB.

⟐ Commented June 18, 2026 at 20:24 MST

HP EliteBook 845 G8: Security Privacy replacement of screen

Thu, 18 Jun 2026 08:57:59 -0700

My screen came with the "Security Privacy" option on this HP 845 G8. The touch screen function is disabled. By design, I've never liked the viewing angles that it forces on the user. Now that I don't require the privacy screen nearly as much in my work, is it possible to change this screen out for a "standard" and/or "touch screen" version? This might be better asked of HP. Otherwise all is working just fine but just am curious to know what my options are.

>>>>>>>>>>>>>>>>>>>

I don't see a "HID - compliant touch screen" entry in Device manager. I don't believe the "Privacy Screen" function is integrated into a "touch screen" on this HP Notebook. This would then suggest that if I was to replace my screen there would have to be two different models for me to choose from.

Can anyone confirm this? What are the part #'s of each ?

Thanks for helping out.

Thanks for any help

Chuck

⟐ Commented June 18, 2026 at 8:57 MST

HP EliteBook 850 G3: Power LED blinks white and orange

Fri, 12 Jun 2026 14:51:56 -0700

This is the second machine I've seen in a week with the same problem, or at least very similar.

The one on my bench presently is an Elitebook 850 G8, the one I replaced a system board on was an Elitebook 845 G7. As soon as any type of power is connected, either battery or AC adapter, the charger LED will turn on white, but blink amber simultaneously. I believe it blinks 10 times. I have been unable to find any documentation for this specific error. This persists even if I remove connections from the system board to any other hardware aside from whichever power I am connecting. Even trying to power on with no RAM gives this error, will not beep/blink to indicate the system does not detect RAM. I do not even need to indicate power on for this to occur. As soon as there is enough contact with whichever connector to transmit the necessary power, it starts.

I have even tried running a BIOS recovery to no avail. This 850 G8 on my bench seems as though it will try to power, keyboard backlight will come up, Caps lock LED will light steady, no blink codes. It's under warranty, so ultimately it's probably going to get a new system board, but I want to know what this error is.

⟐ Commented June 12, 2026 at 14:51 MST

HP EliteBook 840 G1: HP EliteBook 840 G1 Power on but no display (Black Screen) after sitting unused

Thu, 11 Jun 2026 22:17:40 -0700

My HP EliteBook 840 G1 is powering on with a solid power light, but the display remains completely black.

Symptoms:

- Laptop was working fine without a battery, but after being left unused for a week, it stopped showing a display.

- When plugged in, the power button blinks once, then stays solid.

- Occasionally, leaving it on the charger overnight allows it to boot, but it fails again after a shutdown or sleep.

- It auto-powers on as soon as AC is connected if the RTC battery is unplugged.

Steps already attempted:

- Performed multiple hard resets (holding power button for 30s and 2 minutes with all power sources removed).

- Reseated and cleaned the single RAM module; tried it in both slots.

- Disconnected and reconnected the RTC (CMOS) battery.

- Attempted BIOS recovery key combinations (Win+B and Win+V).

- The fan spins, but there are no specific Caps Lock blink codes.

Could this be a failing capacitor on the motherboard, a corrupted BIOS chip that needs a manual re-flash, or a specific power rail issue common to this model?

HP EliteBook 840 G4: Why won't my laptop turn on after pressing the power button

Sun, 07 Jun 2026 21:25:11 -0700

After pressing the power button, it won't turn on and the charging indicator turns on when the laptop is plugged to a power source

⟐ Answer accepted June 07, 2026 at 21:25 MST

HP EliteBook 840 G6: Laptop power blinks white and orange, not turning on.

Sat, 06 Jun 2026 13:19:38 -0700

I have a new laptop, worked fine and then it was dropped. And now it no longer turns on. The power button would light up along with the caps lock light then turn off. I plugged in the charger and it shows no life. So i took the battery out and put the power adapter in and now the indicator light blinks white, amber, and then stays amber. Sometimes the keyboard lights will come on and sometimes it will not but the screen will never come on. Might I mention that while putting the battery connector back in, a light on the board would flash white and go away. Same with the power adapter. I'm not sure what to make of it, I contacted HP Support and they were no help.

⟐ Commented June 06, 2026 at 13:19 MST

HP EliteBook x360 830 G6: What caused my touch screen not working due to wacon device drive

Tue, 26 May 2026 00:31:35 -0700

what caused my touch screen not working due to wacon device drive

⟐ Answered May 26, 2026 at 0:31 MST

HP EliteBook 840 G10: Why is my laptop automatically going on?

Tue, 12 May 2026 23:05:35 -0700

My laptop goes on automatically when I insert the power adapter

⟐ Answered May 12, 2026 at 23:05 MST