I have been using an HP EliteBook 8560p for a while now. It performs tasks very well when on battery power, but when plugged in, it becomes unresponsive and unusable. It was hard to get the task manager screenshot, but I managed.

For some reason, the CPU is at 0.11 GHz when plugged in, but it goes to around 1 GHz (an average speed on the desktop with all apps closed) when on battery power. Can anyone explain and help me solve the significant slowdown of the CPU when plugged in? Thanks.

Here is a picture @oldturkey03,

I decided to check the motherboard's make and model from Windows, and the make is Hewlett-Packard with the model number 1618.

⟐ Answer accepted 7月 05, 2026 at 6:54 GMT-7

⟐ Answered 6月 30, 2026 at 7:05 GMT-7

- Tested with multiple known-good chargers and different wall outlets.

- Tried both USB-C charging ports on the laptop.

- Performed a hard reset by opening the laptop, disconnecting the internal battery, and holding the power button for 15+ seconds to drain residual power.

- Attempted to power the laptop on with the battery disconnected and only the AC adapter plugged in, but there is still no light and no power.

Since there is no light even with the battery bypassed, I suspect a motherboard or DC-in port issue. Are there specific fuses, MOSFETs, or charging ICs on this board known to fail that I should check?

⟐ Commented 6月 28, 2026 at 7:27 GMT-7

⟐ Answer edited 6月 24, 2026 at 8:19 GMT-7

⟐ Answered 6月 24, 2026 at 6:02 GMT-7

⟐ Commented 6月 22, 2026 at 1:40 GMT-7

⟐ Answer edited 6月 19, 2026 at 19:22 GMT-7

⟐ Commented 6月 18, 2026 at 20:24 GMT-7

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

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 6月 18, 2026 at 8:57 GMT-7

⟐ Answered 6月 15, 2026 at 9:12 GMT-7

For context this is the machine I got the board from and threw it in that (now formally) broken 640 G11:

I don't know how in the he double hockey sticks did the donor in that badly. At least it had an intact motherboard, SSD, battery and RAM. I have never seen one this mutilated before; screens and MDM? Absolutely. BIOS passwords? Yes.

Is there a way I can try and get that cover a LITTLE better or is this basically going to need a replacement cover at this point to properly fix the remaining damage? The dent is still bad enough to hang in a laptop bag.

⟐ Commented 6月 14, 2026 at 15:45 GMT-7

Question 2: can then failure to upgrade to windows 11 be the cause of the failure?

⟐ Answer accepted 6月 13, 2026 at 14:05 GMT-7

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 6月 12, 2026 at 14:51 GMT-7

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?

⟐ Answer accepted 6月 08, 2026 at 7:36 GMT-7

⟐ Answer accepted 6月 07, 2026 at 21:25 GMT-7

⟐ Commented 6月 06, 2026 at 13:19 GMT-7