HP Laptop Blue Screen (BSOD) Fix: Stop Codes, Causes & Step-by-Step Solutions

Understanding the HP Blue Screen of Death (BSOD)

A Blue Screen of Death (BSOD) — formally called a Windows Stop Error — appears when Windows encounters a fatal condition it cannot safely recover from. On HP laptops, desktops, and all-in-one computers, the most frequently reported stop codes include:

• INACCESSIBLE_BOOT_DEVICE (0x0000007B) — HP stop code inaccessible boot device
• UNMOUNTABLE_BOOT_VOLUME — HP unmountable boot volume
• KERNEL_SECURITY_CHECK_FAILURE — HP kernel security check failure
• SYSTEM_SERVICE_EXCEPTION — HP system service exception
• WDF_VIOLATION — wdf_violation HP
• 0xC0000021A (STATUS_SYSTEM_PROCESS_TERMINATED) — stop code 0xc00021a HP
• Critical_Process_Died — common after Windows updates
• Driver-specific faults: bthport.sys BSOD, rtump64x64.sys blue screen HP, rtux64w10.sys blue screen HP

Each stop code points to a different subsystem. The sections below walk you through diagnosing and fixing each scenario.

Step 1: Capture the Stop Code

Before fixing anything, record the exact stop code and any referenced .sys file displayed on the blue screen. If the machine reboots too fast:

1. Go to Settings → System → About → Advanced system settings.
2. Under Startup and Recovery, click Settings.
3. Uncheck Automatically restart to keep the BSOD on screen long enough to read.

Alternatively, open Event Viewer after the crash: Windows Logs → System — look for events with Source BugCheck.

Step 2: Boot Into Safe Mode

Most HP blue screen fixes require running the system in Safe Mode so that problematic drivers are not loaded.

Method A — From a working Windows login:

1. Hold Shift and click Restart.
2. Navigate to Troubleshoot → Advanced options → Startup Settings → Restart.
3. Press 4 or F4 for Safe Mode, or 5/F5 for Safe Mode with Networking.

Method B — HP laptop blue screen at startup (cannot reach login):

1. Force-shutdown the laptop three times in a row (hold power button until off). Windows will auto-enter the Windows Recovery Environment (WinRE).
2. Go to Troubleshoot → Advanced options → Startup Settings → Restart.
3. Select Safe Mode.

Step 3: Fix Driver-Related BSODs (bthport.sys, rtump64x64.sys, rtux64w10.sys)

bthport.sys is the Windows Bluetooth port driver. A corrupt or outdated version causes Bluetooth-related BSODs on HP EliteBook, HP Pavilion, HP Envy x360, and HP ProBook.

rtump64x64.sys / rtux64w10.sys are Realtek Wi-Fi/network drivers. They are the most common cause of networking-related BSODs on HP Stream, HP Omen, HP Victus, and HP ZBook.

To fix driver BSODs:

1. Boot into Safe Mode with Networking.
2. Open Device Manager (right-click Start → Device Manager).
3. Expand Bluetooth or Network Adapters.
4. Right-click the flagged device → Update driver → Search automatically.
5. If the BSOD started after a driver update, choose Properties → Driver tab → Roll Back Driver.
6. To completely remove and reinstall: right-click → Uninstall device → check Delete the driver software → reboot.
7. Download the latest driver directly from HP Support (support.hp.com) using your model's serial number.

Step 4: Repair System Files with SFC and DISM

Corrupt Windows system files cause SYSTEM_SERVICE_EXCEPTION, WDF_VIOLATION, and 0xC0000021A on HP laptops. Run these commands from an elevated Command Prompt or from WinRE:

sfc /scannow
DISM /Online /Cleanup-Image /CheckHealth
DISM /Online /Cleanup-Image /ScanHealth
DISM /Online /Cleanup-Image /RestoreHealth

After DISM completes, rerun sfc /scannow and then restart.

Step 5: Fix INACCESSIBLE_BOOT_DEVICE and UNMOUNTABLE_BOOT_VOLUME

These stop codes indicate Windows cannot read the boot drive. This is common on HP Pavilion and HP all-in-one systems after a failed Windows Update or a sudden power loss.

1. Boot from a Windows 10/11 USB installation media or use WinRE.
2. Select Repair your computer → Troubleshoot → Advanced options → Command Prompt.
3. Run the boot repair sequence (see code block section below).
4. If the drive shows errors in chkdsk, the storage device may be physically failing — back up data immediately.

Step 6: Fix HP Blue Screen Automatic Repair Loop

If your HP laptop keeps restarting into "Automatic Repair" and then blue-screens again:

1. From WinRE, go to Advanced options → System Restore and choose a restore point created before the BSOD started.
2. If no restore point exists, go to Advanced options → Uninstall Updates and remove the latest Quality or Feature update.
3. Use Startup Repair (Advanced options → Startup Repair) to let Windows attempt an automated fix.

Step 7: Test RAM with HP PC Hardware Diagnostics

Failing RAM causes random, inconsistent BSODs. HP devices have a built-in hardware diagnostic tool:

1. Shut down completely.
2. Power on and immediately press Esc, then F2 to enter HP PC Hardware Diagnostics UEFI.
3. Run Component Tests → Memory → choose Extensive Test.
4. If errors are found, reseat or replace the RAM sticks.

For a thorough external test, use MemTest86 (bootable USB), running at least 2 full passes.

Step 8: HP Printer Blue Screens (HP Envy 4520, HP Envy Photo 7155, HP Envy Photo 7855, HP OfficeJet 4650, HP OfficeJet Pro 7740, HP OfficeJet Pro 9015)

HP printers displaying a solid blue screen or flashing blue light are different from a Windows BSOD. These typically indicate:

• Firmware corruption: Perform a hard reset — unplug the power cord from the printer and wall, wait 60 seconds, reconnect.
• Control panel lockup: Hold the power button for 30 seconds, release, wait 5 seconds, then power back on.
• Firmware update needed: Connect via USB and use HP's firmware update utility from support.hp.com to push the latest firmware.
• Hardware fault: If the screen remains blue after a reset and firmware update, contact HP Support — the printer's control panel or formatter board may need replacement.

Step 9: Last Resort — HP Recovery / Windows Reset

If all steps above fail:

1. In WinRE: Troubleshoot → Reset this PC → Keep my files (attempts to preserve data) or Remove everything.
2. If WinRE is inaccessible, create an HP Recovery USB via HP Cloud Recovery Tool (see support.hp.com/us-en/document/ish_4705764-4705800-16) and boot from it.
3. For corporate HP EliteBook, ProBook, or ZBook devices, use HP Image Assistant to deploy a clean, tested image.

Model-Specific Notes