A pic?
Is the video card selector present?

https://theretroweb.com/motherboards/s/asus-p5nsli

I'd read the manual for unusual settings.

Nexxen wrote on 2024-04-23, 13:03:

A pic?

You could try by reprogramming the bios.

Deox the cpu socket.

You don't have a POST card? That could help.

Nexxen wrote on 2024-04-23, 13:23:

You could try by reprogramming the bios.

Deox the cpu socket.

You don't have a POST card? That could help.

I just bought a post card this weekend from eBay, waiting for it to get here. I don’t have any “deox “.

Should it give beeps with no cpu though? I always thought it did.

Thanks for the help!

johnvosh wrote on 2024-04-23, 15:12:

I just bought a post card this weekend from eBay, waiting for it to get here. I don’t have any “deox “. […]
Show full quote

Nexxen wrote on 2024-04-23, 13:23:

You could try by reprogramming the bios.

Deox the cpu socket.

You don't have a POST card? That could help.

I just bought a post card this weekend from eBay, waiting for it to get here. I don’t have any “deox “.

Should it give beeps with no cpu though? I always thought it did.

Thanks for the help!

Maybe try some alcohol, if they are somewhat oxidized it could avoid cpu to work.
Go light on it.

No cpu it shouldn't beep, with a cpu it should. Not all did, maybe the manual says something.

Did you have a CMOS battery installed when you tried it out? Some motherboards will not POST without one.

johnvosh wrote on 2024-04-23, 13:15:

Nexxen wrote on 2024-04-23, 13:03:

A pic?

There is no sticker on the Bios, so maybe somebody played around with it.
Without a Bios nothing happens.

EDIT: Of course without CPU it is the same. Even if it can beep without memory, minimum should be CPU and RAM.

I see discoloration under the north bridge, hopefully solder joints are not cracked under the chip, not a big fan of nForce motherboards with passive cooling.

Repo Man11 wrote on 2024-04-23, 16:31:

Did you have a CMOS battery installed when you tried it out? Some motherboards will not POST without one.

Put a fresh one and tried with out and no change.

Karbist wrote on 2024-04-23, 18:58:

I see discoloration under the north bridge, hopefully solder joints are not cracked under the chip, not a big fan of nForce motherboards with passive cooling.

I removed the chipset heatsink and everything was looking good, no discolouration. It could be the angle of the camera and light....

I took and reseated everything, but a fresh battery in. I even took and removed the heatsink from the CPU and had my finger on the power switch of the PSU. The CPU is getting warm, slowly, so I'm guessing that means the CPU is working? I have tried two different video cards and no difference.... Even tried without a video card in and still no beep saying that it has posted or anything.

What´s that black stain supposed to be?

johnvosh wrote on 2024-04-24, 00:32:

I removed the chipset heatsink and everything was looking good, no discolouration. It could be the angle of the camera and light....

The copper on back of the board beneath the north bridge has darker color in your pic.

Suspecting that the chipset (nforce 5) is form the time when nvidia produced defective chipsets. If it is form that era, theres no fix for it.

Have you tried testing the CPU in another board or swapping in a different CPU?

Can you post a pic of the north bridge?

kotel wrote on 2024-04-26, 17:10:

Can you post a pic of the north bridge?

goofyahhuncle wrote on 2024-04-26, 07:20:

Have you tried testing the CPU in another board or swapping in a different CPU?

Unfortunately I don't have another CPU that will work in this board. This CPU was pulled from a working system.

nForce 4 SLi. Forget fixing it, it's bumpgate and nothing will fix it because it's the substrate that has gone bad.
I have had several nForce 4 boards (both AMD and Intel) that have went to the trash for that reason alone - bumpgate riddled chips that did not get a revised version with fixed bumps.