Omen 25L gaming Desktop will not power on

[Aprilnicole]

My omen 25L gaming Desktop will not power on. I have tried all the things such as unplugging, holding down the power button. Replaced the plug. Replaced the cmos battery. Only had it a year!

Please help!!

[Hawks_Eye]

Hi @Aprilnicole 

Welcome to the HP Support Community! 

Thanks for posting your query! We're here to help you get back up and running.

It’s frustrating to encounter a power issue with your Omen 25L, especially when it’s relatively new. 

Since you’ve already tried basic troubleshooting steps like unplugging, holding the power button, replacing the power cable, and even swapping the CMOS battery, let’s go a bit deeper into possible causes and solutions:

 

1. Check for Signs of Power

Look for any lights on the motherboard or internal components. Many gaming desktops have a small LED on the motherboard that indicates it’s receiving power.

If there are no lights or fans running, the issue may involve the PSU (power supply unit) or internal connections.

 

2. Power Supply Unit (PSU) Check

A faulty PSU is a common cause of no power:

Make sure the PSU switch on the back is set to "On" (| symbol).

If possible, test the PSU with another system, or use a PSU tester to confirm it’s functioning.

If the PSU is the issue, you’ll need to replace it with a compatible one—ensure it has the necessary wattage for your system's components.

 

3. Reseat Internal Components

Components might have come loose due to movement or vibrations:

Open the side panel of the case (ensure the system is unplugged first).

Disconnect and reconnect the power cables from the PSU to the motherboard, graphics card (if applicable), and drives.

Reseat the RAM sticks and ensure they are firmly locked into place.

Check the CPU power connector (8-pin) and the 24-pin motherboard connector.

 

4. Test Power Button Connection

The issue might be with the power button or its connection to the motherboard:

Locate the front panel connector on the motherboard.

Use a flathead screwdriver to short the two pins for the power button manually. If the system powers on, the button or its wiring may be faulty.

 

5. Perform a Barebones Test

To rule out a component failure:

Disconnect all non-essential components (e.g., GPU, extra drives, peripherals).

Leave only the motherboard, CPU, one stick of RAM, and the PSU connected.

Try powering on the system with this minimal configuration.

 

6. Inspect for Physical Damage

Look closely for:

Burn marks or bulging capacitors on the motherboard or PSU.

Signs of dust buildup or obstructions in cooling fans, which could cause overheating-related shutdowns.

If this solution hits the spot, please come back and click "Accepted Solution" to help others find the answer. And if you'd like to say thanks, select "Yes" on the bottom left of the public post, as that would make our day! 

Take care, and have an amazing day!

Regards, 

Hawks_Eye