HP Omen 25L Power Supply

[temp96]

Hello,
The other day after using my computer, I turned it on again, and it wouldn't boot up.
I did several tests by disconnecting the power supply and pressing the power button several times.
I reconnected everything and it still won't turn on.
I know it's out of warranty; it's an OMEN HP Obelisk Desktop 875-0004np computer; on some websites it appears as Hp Omen 25L.
It's the one that has a kind of logo in the shape of a mask, or something similar, on the top of the front.
Are there standard power supplies compatible with this computer?

Is there any way to check if it's the power supply or the motherboard that's broken?
Can the power supply that comes with the computer from the factory be replaced and another one with a higher power installed, and have everything work?
Thanks.
Regards.

[Bill_To · Accepted solution]

Hi @temp96 

Welcome to the HP Forum.

I can't find your specific HP Product to check which MB is installed.

The existing power supply, if it is a standard ATX power supply, would have two direct connections to the MB:

1. A 24 pin MB connection

2. A 4 pin CPU connection

You can buy a retail power supply having similar dimensions to the HP power supply if your MB has these two connections and you are going to install the new PSU in the case. Maybe a friend has a spare power supply you can use before buying a new power supply.

I would try the HP power supply again after checking/reseating all connections on the MB if the PC shows no signs of life when depressing the power button. It never hurts to do a simple CR2032 MB battery replacement if you have not done this.

Then try to start the PC, using the HP PSU , in a minimum configuration: (only the CPU and one stick of RAM in each memory slot). Try each stick of available HP memory in each memory slot to test for a POST.

It is also possible the power button could have failed.

Then try any, known good and compatible, replacement power supply. You don't have to install the test power supply in the case to check for a successful POST when trying a second power supply. PSU dimensions will not matter in this scenario.

A no go would suggest a different component has failed after trying a different, known good, power supply.

You would need a local PC Tech at this point to find the bad component. Using a local PC Tech would be less expensive than buying replacement components.

Regards

[temp96]

Hi Bill_To,
Thanks for your welcome message and your reply.
I'm new to this forum in English, since the Spanish one is not available for posting new messages.
I've tried the options you've indicated, but I haven't tried it yet, but I've tried it with a different power supply than the one that comes with the computer.
Knowing this, I'm going to remove the motherboard from the chassis and test it outside, with another power supply, first without graphics, to see if it beeps, and then with a basic graphics card, which doesn't need power.
I've already tried with other types of memory, and in the 2 possible slots.
My computer model is an OMEN by HP Obelisk Desktop 875-0004np
In the BIOS it appeared as OMEN by HP Obelisk Desktop 875-0xxx
On the motherboard there is a label that says:
SP#L23867-001 AS# L23867-001
If I turn the motherboard over, and on the bottom you can read the inscription:
17582-1 REV.A
348.0C504.0011
The power supply, at first glance, seems standard, with a 24-pin power connector and an auxiliary 4-pin connector.
It's 300W and the part number is L20530-001
I had read on some website that the power supplies for these HP computers came with some kind of chip that detected whether or not it was connected to an HP motherboard. If you confirm that I can use a power supply from any other brand, I will do my best to repair the computer and if I can't because the motherboard is broken, I will sell the computer for parts and I will not buy another HP computer again.
The Obelisk range of gaming computers are too expensive to then break down as soon as the warranty expires and there are no spare parts.

[Bill_To]

Hi @temp96 

My pleasure.

Your plan sounds good.

Other folks in the Forum have used retail power supplies in the HP Obelisk PCs with no problems.

Trying a different power supply with the HP MB should let you know if you have a MB or CPU problem.

CPUs also fail but this is very rare.

Try the MB with one stick of, known good, RAM and then try using no RAM. The MB should beep with no RAM installed if it's powering on and trying to enumerate installed components.

Regards