My laptop screen is black with a CMOS invalid icon

[16Gloria]

HP Envy with CMOS reset (502) notification that won’t go away

[Hawks_Eye]

Hi @16Gloria 

Welcome to the HP Support Community! We're here to help you get back up and running.

Thanks for explaining the issue—seeing a black screen with a persistent CMOS Reset (502) notification can be deeply unsettling, especially when it keeps returning despite your efforts.

This error typically points to a BIOS or CMOS configuration problem, often triggered by a failed update, battery drain, or hardware instability. Here's a structured approach to help you resolve it:

 

Step-by-Step Recovery for CMOS Reset (502)

1. Perform a Full Power Drain

• Disconnect the AC adapter and remove any connected peripherals.
• Press and hold the power button for 30 seconds to discharge residual power.
• Reconnect the power and try booting again.

 

2. Clear CMOS via BIOS Menu

• If the system boots to the error screen, press F2 or F10 to enter BIOS Setup.
• Once inside, press F9 to load default settings.
• Press F10 to save and exit.

 

3. Update BIOS Using USB Recovery

• Download the latest BIOS for your HP ENVY model:
  HP ENVY x360 15m-ee0023dx BIOS Update
• Use HP’s recovery method:
  HP BIOS Recovery Guide
• Follow the steps to create a recovery USB and flash the BIOS.

 

4. Check RTC Battery (if accessible)

• If your laptop is out of warranty and you're comfortable opening it:
  • Look for a coin-cell battery on the motherboard.
  • If removable, reseat or replace it.
• If not accessible, skip this step—many modern HP laptops use soldered RTC batteries.

 

5. Run HP Hardware Diagnostics

• Press Esc repeatedly at startup → choose F2 for diagnostics.
• Run System Tests and Component Tests, especially for memory and storage.

You’ve already shown great initiative by researching and trying multiple fixes. 

Let’s get this resolved so your system boots reliably again. If you'd like help preparing a BIOS recovery USB or interpreting diagnostic results, I’m here to guide you through it.

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Take care, and have an amazing day!

Regards, 

Hawks_Eye