Are HP OEM PSU not standard?

[Gdanielz]

I blew up my h8-1240t motherboard. Or so it seems because the computer doesn't turn on nor even make any noise or sign.

I am trying to replace the motherboard with one from a Dell desktop. The "new" mobo works fine with my CPU and RAM; it starts just fine with Dells PSU, but when I install the "new mobo" into my HP desktop case it won't turn on; led indicators show that there's a PSU/Motherboard error. I finally realized that the problem is HP's PSU because when I "transplant" Dell's PSU the new mobo works. The bad thing is that Dell's PSU is about 250w and I need 300w (which is my HPs PSU). Counting and comparing the 24 pin connector wires I noticed that HPs PSU does not have a blue wire: it has 2 null points out of the 24 pins. Dell's PSU has a blue wire and only 1 null points out the 24 pins (I compared with two PSUs from different Dell desktops).

Does anyone know if I can do something on my HPs PSU to make the other mobo work? I wouldn't want to buy a new PSU.

[old_geekster]

@Gdanielz, welcome to the forum.

I am not aware of any proprietary PSU's in Omen computers.  I have helped numerous members upgrade their PSU's without any problems.  They all used standard ATX PSU's.  Here is the PSU that came with your computer from Walmart.  It shows regular ATX.

Here is the computer components on HP Partsurfer.  Scroll down towards the bottom of the page to find the PSU.

[Gdanielz]

@Old_Geekster: thank you for the welcome, the links and your comment.

I followed the links you provided and, as I understand the info in them, "standard ATX" refers to the form factor; as opposed, for example to small form factor. I did try in a couple of other non HP motherboards and my PSU didn't work. The "bended clip" test proves the PSU works. I still believe it has to do with the missing blue wire.

Thank you.

Here a picture with a blue arrow showing where I've seen a blue wire on other PSUs.

[wb2001]

@Gdanielz 

As you are trying to meld a DELL motherboard into the HP case,  I had to pondered on the issue.

1) Dell PSU's are not typical ATX. You learned that the hard way because the wiring is different.

2) I was somewhat in awe that you go the front end (front panel wiring) to match up. (You did that, right?).

3) The hard drive from the HP motherboard should not activate Windows OS with the Dell motherboard.

Your creating a Franken-Dell in an HP case.  You need a Dell PSU to continue, or an adapter for ATX 24 pin to Dell. What is the origin of this motherboard.  Maybe a Dell 780?

[Gdanielz]

Thanks @Wb2001

1. Aye, aye sir.

2. I didn't rewire the front panel. I transplanted Dells mobo, psu, front panel and power button.  Before you wrote your message my son and I named this hybrid Franky... very similar to your FrankenDell.

3. It did activate. I can only explain this by saying than the Dell (an Optiplex 7010) was running Windows 8 before going out of service.

Here a pic of face-less Franky where you see: 1. Dells front panel; 2. Dells power button.

In the end, too much effort for an ugly computer; wife and son are not happy, neither am I. I will be building a new one.

[Gdanielz]

Now I just want to pay tribute to an HP that served me well all this time, excellent post-sales service and lots of work and games done on it.

HP Pavilion HPE h8-1240t Desktop PC
• Windows 7 Home Premium [64-bit]
• 3rd Generation Intel(R) Core(TM) i7-3770 quad-core processor [3.4GHz, 8MB Shared Cache]
• 8GB DDR3-1333MHz SDRAM [2 DIMMs]
• 1TB 7200 rpm SATA hard drive
• 1GB DDR3 AMD Radeon HD 7570 [HDMI, DVI, VGA via adapter]
• 300W Power supply
• Blu-Ray player
• Wireless-N LAN card (1x1)
• 15-in-1 memory card reader, 2 USB 2.0 (front), 2 USB 3.0 (top)
• Beats Audio (tm) -- integrated studio quality sound
• HP backlit Beats keyboard & optical mouse