It's caplock is blinking once and the fan is making noise and not turning on

[6407]

Hp core i5 

[Max3Aj]

@6407, Welcome to HP Support Community. 

Thank you for posting your query, I will be glad to help you. 
The issue you're describing Caps Lock blinking once, fan noise, and the notebook not turning on typically indicates a hardware-related error, often linked to the CPU.
A single blink of the Caps Lock LED usually points to a CPU failure or a motherboard issue. However, before concluding hardware failure, let's try a few troubleshooting steps:

Perform a Hard Reset

This can help clear any residual electrical charge that might be causing the issue.

• Turn off the notebook.
• Disconnect the power adapter.
• Remove the battery (if removable).
• Press and hold the Power button for 15 seconds.
• Reconnect the battery and power adapter.
• Try turning on the notebook.

Check for Overheating or Dust

• Ensure the vents are not blocked.
• Use compressed air to clean out dust from the vents and fan area.

Try a BIOS Recovery

If the system is not booting but the fan is spinning, a BIOS recovery might help.

• Turn off the notebook.
• Press and hold Windows + B, then press and hold the Power button for 2-3 seconds.
• Release the Power button but continue holding Windows + B until you see the BIOS recovery screen or hear beeping.

Use HP Hardware Diagnostics (if accessible)

If the notebook powers on briefly, try running a system diagnostics test:

• Turn off the notebook.
• Press the Power button, then immediately press Esc repeatedly until the Startup Menu appears.
• Press F2 to open HP PC Hardware Diagnostics.
• Run the System Test or Component Tests. 

I hope this helps. 

Take care and have a good day. 

Please click “Accepted Solution” if you feel my post solved your issue, it will help others find the solution. Select "Yes" on the bottom left to say “Thanks” for helping! 

Max3Aj

HP Support