(kb5078885) WINDOWS 10 PRO 22H2

Question

Multimedia button cable.jpegHello, I have an HP ProBook 650 G2 laptop. Yesterday, March 14, 2026, I installed an update to Windows 10 Pro 22H2 (KB5078885). The installation was successful. I shut down the laptop, and after a while, I restarted it as usual, but it didn't work. I suspected the problem was with the RAM. I have two RAM modules: one is an Adata 8GB DDR4 at 2400MHz, and the other is a Samsung 4GB DDR4 at 2666MHz. I was surprised to find that the Samsung RAM stopped working. I tried changing the channel and replacing the RAM, but the problem was with the Samsung RAM. I opened the laptop, cleaned it thoroughly, and reassembled it, but the problem persists. I tried checking the BIOS settings, performing a factory reset, and completely unplugging the laptop, but the problem remains. My RAM is Samsung. I checked my RAM for any faults or defects and noticed a minor issue with its pins, which I fixed. However, the problem persists. I then configured my router as usual before updating my computer.

Note: Over a week ago, I disabled Developer Options on my Samsung phone, and after this issue, I enabled them again.

But the problem still exists. The next day, I used my Samsung phone's camera to check the RAM for any defects. After that, the laptop booted up successfully using both Samsung RAM and A_Data memory. Now I want to know the cause of the problem and why I'm experiencing RAM issues after installing the Windows 10 Pro 22H2 update (kb5078885). Thank you. Note: I found a connector inside the laptop case. (Multimedia button cable +Smart Card scanner or input cable) This connector has a charging indicator, a battery charging indicator, and a system/hard drive power indicator. One of its pins was bent, angled, or twisted, or it might have been connected to an adjacent pin, which could have caused a problem with the motherboard. I have now repositioned it correctly.

Edited

Answer 1

Thank you, but I believe the following:

1. It is advisable to use identical RAM modules (same size, speed, and manufacturer) to minimize compatibility issues.

This is due to the device configuration and the laptop's chassis. Different electronic components result in different internal component configurations.

This can lead to simultaneous component failure or overheating.

2. Intermittent connection or installation problems. The Samsung module initially failed the POST test, then worked again after several attempts to remove and reinstall it, as well as manual handling.

As I mentioned earlier, I narrowed the problem down to the internal components. Opening the chassis and thoroughly cleaning the internal components, while directing heat onto the motherboard and RAM, did not reveal any component issues. The problem lies in the RAM. The update (KB5078885) unexpectedly caused a burn-in on the motherboard's circuit board. Alternatively, the router settings could be the cause, specifically the power supply or the burn-out wattage from connected or nearby devices, which affected the laptop's boot process due to the default settings. However, to pinpoint the problem to one source, the burn-out wattage from nearby devices is the likely culprit.

Answer 2

It is very unusual for a Windows update to cause problems with the RAM, most likely it is just a coincidence this happened after an update, have you ever tested your RAM sticks one at a time for errors with the Windows Memory Diagnostics utility or with MemTest86?

Answer 3

The Windows 10 Pro 22H2 cumulative update (such as KB5078885) does not change hardware characteristics like RAM voltage, timings, or slot behavior. A Windows update can expose an underlying hardware or firmware instability (for example, by changing boot sequence, drivers, or power states), but it cannot selectively “break” a single RAM module and then allow it to work again without any further hardware change.

From the described behavior, the most likely causes are:

1. Intermittent hardware contact or seating issue
   • The Samsung module initially failed to POST, then later worked again after multiple removals/reinsertions and physical handling.
   • This pattern is typical of marginal contact in the RAM slot or on the module’s edge connector, or dust/oxidation that was disturbed during cleaning and reseating.
2. Mixed RAM modules and marginal stability
   • The system is running two different modules (8 GB 2400 MHz and 4 GB 2666 MHz) from different manufacturers.
   • Mixed modules can be stable, but they also increase the chance of borderline timing/compatibility issues that may show up only under certain conditions (cold boot vs warm boot, different power state after an update, etc.).
3. Power/firmware state after update
   • After a feature or cumulative update, Windows may change how it shuts down or restarts (e.g., Fast Startup state, driver initialization order).
   • If the system was already marginal with mixed RAM, the first cold boot after the update might have hit a combination of timings or power conditions that exposed the weak contact or borderline module behavior.
   • Once the module was reseated/handled and the system had a few successful boots, the issue stopped appearing.
4. Coincidental timing with the update
   • The fact that the problem appeared right after installing KB5078885 does not necessarily mean the update caused a physical RAM issue.
   • Intermittent RAM or slot problems often show up after any event that involves a full power cycle (shutdown, moving the laptop, opening the chassis), which happened in the same time window as the update.

Given that the laptop now boots and uses both modules correctly, the root cause is almost certainly:

• A transient or intermittent hardware issue (RAM module contact, slot, or mixed-module timing), coincident with the Windows update and first reboot.
• Not a permanent change introduced by KB5078885 to the RAM itself.

If the issue reappears, recommended next steps would be:

1. Test each RAM module alone in each slot to confirm both the module and slot are stable.
2. Run a memory diagnostic (e.g., Windows Memory Diagnostic from the boot menu) to check for intermittent errors.
3. Consider running matched RAM modules (same size, speed, and manufacturer) to reduce compatibility edge cases.
4. Ensure BIOS/UEFI firmware is up to date from HP, as firmware updates can improve memory compatibility.

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References:

• Why won't my keyboard work when I power up my laptop? - Microsoft Q&A
• "Windows Update" Updates failed - Microsoft Q&A
• Latest Security Update KB5079473 (26200.8037) Fails to Install - Microsoft Q&A
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