Question CPU Usage 100% (System interrupts) after RAM upgrade

[Beast_Master]

Hello,

I have a HP 17 by 3042nm laptop with 8 GB RAM and I tried to upgrade it with another 8 GB module. The original one was SK Hynix DDR4 2666 MHz CL19, so I bought the most similar module I could find in computer shops near me. I bought a Kingston 8 GB DDR4 2666 MHz CL19 module.

When I installed it, the laptop recognized the new module, but when I logged on to Windows, CPU usage was at 100%, with the culprit being "Systems interrupts" process. I've tried running every analytical tool, no errors.

I tried removing the new module, but now it happens with the old module as well.

Lastly, I did a clean install of Windows 11. The CPU usage was still 100%.

What could be causing it? Thanks!

 

[Darkbreeze]

So, try this. Actually TRY it, because at this point you have nothing to lose in this regard.

Install both memory modules.

Then, do a hard reset. For a laptop it will be somewhat different than for a desktop but the gist will be that you need to identify where the CMOS battery exists in your unit, then, either remove the battery or disconnect the connector going to the CMOS battery. Then, press the power button on the laptop continuously for about 30 seconds. Then put it all back together and power up. And also, BEFORE you do any of this, make SURE you have the MOST recent BIOS version installed. If you do not, then update, then check things, then do as I suggested.

I can post pages of successful results from previous threads, but the point is, even if it's not the solution, it IS the steps you should take before moving on.