I think you will have to search the Internet for a replacement motherboard. One place you can look is eBay. There may be other computer parts sellers that have a replacement motherboard. You should look for another WPMFG, otherwise, you will have problems with compatibility issues because of Dell proprietary interfaces.

@Linkn17  - Why do you think the motherboard needs to be replaced?

And what version of Windows?

I think this is the right MB. 

https://www.gefionk.com/index.php?main_page=product_info&products_id=93160

I took it into a repair shop and that's what they diagnosed. 

Nothing starts... So it has nothing to do with Windows. 

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@Linkn17 wrote:

I took it into a repair shop and that's what they diagnosed. 

Nothing starts... So it has nothing to do with Windows. 

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Did they rule out the power supply? 

And it's always helpful to include the version of Windows in your posts...

They said they would need to replace the MB and CPU... and probably the case. I didn't take it much further than that.

@Linkn17 I am not sure how the shop would know if the CPU is bad unless they replace the motherboard first or is able to test the CPU independently. Since Dell's motherboards are proprietary, there would be issues putting the motherboard in another case. 

Well, since Dell doesn't have a MB to replace it, they would have to use another brand. If they change the MB to a non-dell MB, the CPU would need to be changed as well since Dell parts are proprietary.  

Hey @Anonymous ,

Little background... This DELL XPS 8910 was bought in Canada but Im now living in Mexico. Where... the "service shops" are not exactly top professionals in the field. So, Im stuck using what I have locally here unless I send it away which Im not to keen on doing.

Personally, I was an IT Analyst for 10 years. The saying goes, the worst thing you can do is give a programmer a screwdriver! Nuff said, but true. Not a hardware guy but I don't mind opening up a case and having a look.

I've been told by DELL and my local repair guys that I have to use a Dell MB in this system to make it work with the components. 

Im all for getting another brand of MB if it will work. That being said, I have no idea what I am supposed to be looking for or what works with what. 

The system has these parts I would like to reuse:
490-BDEF : NVIDIA(R) GeForce(R) GTX 960 w ith 2GB GDDR5 Graphics Memory

400-ANHG : 256GB M.2 PCIe x4 SSD + 2TB 72 00 rpm Hard Drive

370-ACFI : 24GB Dual Channel DDR4 2133MHz (8GBx2 + 4GBx2)