Start up and then goes outa second later

[Southnbelle]

I turned my computer off and back on to reboot. When I press the power button it attempts to start up then a second or so it goes back out. 

[A_Gayathri]

Hi @Southnbelle,

Welcome to The HP Support Community.  

Thank you for posting your query, I will be glad to help you.

I understand you are facing an issue with your HP Pavilion Desktop is experiencing a power or hardware issue. 

Here are some steps you can try to diagnose and potentially fix the problem:
 

Check Power Connections:

• Ensure that all power cables are securely connected to the computer and the power source.
• Try using a different power outlet or power cable if available.

Inspect Hardware Components:

• Open the case (if you are comfortable doing so) and check if all internal cables are properly connected.
• Ensure that the RAM, hard drive, and other components are securely seated in their slots.

Reset the CMOS Battery:

• Sometimes, resetting the CMOS battery can resolve startup issues. Power off the computer, unplug it, and remove the CMOS battery (a small, round, silver battery on the motherboard) for a few minutes before putting it back in.

Perform a Hard Reset:

• Disconnect the power cord and any peripherals.
• Press and hold the power button for about 15 seconds to discharge any residual power.
• Reconnect the power cord and try turning on the computer again.

Check for Diagnostic LEDs or Beeps:

• If your computer has diagnostic LEDs or beeps, check the pattern and refer to the HP support documentation for possible meanings.

Test with Minimal Hardware:

• Disconnect all non-essential peripherals (printers, external drives, etc.).
• Try booting the computer with just the essential hardware connected (monitor, keyboard, mouse).

Look for Overheating Issues:

• Ensure that the computer’s fans and vents are not obstructed and are working properly.
• Overheating can sometimes cause the computer to shut down abruptly.

Try Safe Mode:

• If the computer starts but shuts down shortly after, you might be able to boot into Safe Mode. This can be done by pressing the F8 or Shift + F8 key during startup, though this might be tricky if the startup is very brief.

Refer to this document: HP Pavilion Desktop - 510-a010 (ENERGY STAR) User manual

I hope this helps. 

Take care and have a good day.

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