HP pavilion 15-cw0003no will not start after last upgrade

[lindt]

The computer won´t start, it only say´s "sihost.exe - systemvarning" ! Unknown Hard Error.

If I click "OK" I can log in, but then it just stands working and then turnes black.

Any suggestions?

[MathewT]

Hi @lindt

Welcome to HP Forums!

I would like to take a moment and thank you for using this forum, it is a great place to find answers.

I understand you have some issues with your computer and it's not booting up after the update.

Solution 1. Perform a Clean Boot on Your Windows 10

To fix sihost.exe unknown hard error, the first thing you can do is to determine if a third-party software is causing the issue. You can log in Windows 10 as an Administrator and then perform a clean boot on your computer. Take the steps below:

Step 1. Press Windows + R to open the Run dialog box. Then type “msconfig” into the box and click OK.

Step 2. Go to General on the System Configuration. Click “Selective Startup” and uncheck the “Load startup items”.

Step 3. Go to Services and check “Hide all Microsoft services”, and then click Disable all.

Step 4. Click OK, and then click Restart on the new pop-up dialog box.

Solution 2. Run SFC/Scannow Command to Detect Corrupted System Files

The sihost.exe unknown hard error after Windows 10 Update is related with corrupted system files. To have this error fixed, you can follow the steps below to SFC/Scannow command to detect the broken or missing system files.

Step 1. Press Windows + X or right click the Start button to access the Power User Menu.

Step 2. Choose Windows PowerShell (Admin) on the Power User Menu to open the command prompt.

Step 3. Type “sfc /scannow” in the command prompt, and then press Enter.

After you press the Enter button, Windows 10 will automatically scan the system and resolve the broken system files. This process may take you some time. And you need to restart your computer after this process is finished.

Solution 3. Check Hard Drive

Run an extensive test on the computer to check for hardware issues and get back to me with the details.

1. Hold the power button for at least five seconds to turn off the computer.

2. Turn on the computer and immediately press Esc repeatedly, about once every second. When the menu appears, press the F2 key.

3. On the HP PC Hardware Diagnostics (UEFI) main menu, click System Tests.

4. Click Extensive Test.

5. Click Run once

Solution 4. System Restore

If the test clears and if you continue to have the same issue, I would request you to restore your computer to a previous date when your computer was working.

System Restore: https://support.hp.com/in-en/document/c03327545

I hope this information helps.

If you feel I was helpful, simply click on Accept as Solution to help the community grow.

Cheers