NLX Motherboard beeps

As to the battery, This unit is targeted to industrial customers so solder skills are pretty much expected. If not, get it done by almost any tech. It's cheaper than a new unit.

Sorry if I upset people over minor repairs like this. I'm running into more and more folk that will not learn basic repair skills and flame out over items like this. It is a minor piece of work that your first year techs should not hesitate to work.

Thanks for your reply. I have solder skills but don't know much about old PC computers, I normally work with analog audio equipment. The reason I said it's "really difficult to replace" is simply because it is. There is a bunch of stuff in the way (some kind of connector I think) that you need remove and even then there's not much space to work.

As stated above, the battery is already replaced (by me), but the same problem persists. Maybe I should have been more clear, my question is: Do I need to take additional actions after the battery is replaced? Like some software reset of the BIOS settings or something like that?

Next question: What else could be the problem? And potentially is there any other solution than to replace the motherboard?

We'll need a service manual on the product next. It looks like some industrial PC and some of those needed a special keypress to reset the values in the BIOS. I did not find manuals so this one is pretty much for what you can find and what the manufacturer reveals.

Good to hear the battery was replaced but a trip to the BIOS to load defaults is how it's done in mainstream PCs but this one is custom so they may have done this another way.

If you insist on "what I need to do" I have to send you to the maker. Here we are stuck with what we can find and what we've learned over the years. Since I would want to avoid a call to the maker right away the CMOS clear should be done. It's something very common with PCs in the millions and yes, this is not like the millions of PCs but something close enough.

Get that done and hope it's enough.

As to the black screen everyone would be guessing without a full service manual.
That manual is not a service manual and when these things get past a few years you find the maker will not service them but only replace them. This has causes some to lash out or "flame."

So give it a try then call the maker for what to do next.

I’m not a native english speaker, maybe I should have chose the words: ”I’m not sure that’s what I want to do”...

This motherboard runs Windows NT to control the functionality of a 10 000 USD reverbation unit that is no longer in production and not supported by the manufacturer. There is no one who can service these in my country, a lot because there is nowhere to get spare parts. The alternative if I can’t get it up and running is to spend ~5 000 USD on another used unit that will maybe last for another year or two..

So believe me, if I could just call the maker and get support + spare parts, I would.

Relly appreciate your input. Will try the CMOS reset jumper configuration and see what happens. I also have a new (used) motherboard arriving soon.

Tried to connect the jumper and wile it was connected the board would not boot at all, but when removed it's all fine now.

Now I just need to make sure if there is some other BIOS setting that need to be modified. However the unit boots fine and everything looks ok.

As to support, costs, etc. I am running into companies that have a dedicated device, box or thing with no backup systems. Your company got lucky this time. Let's hope they use this as the learning moment about starting the search for support and replacements.

I'm just someone that dealt with SBCs a lot over the years as well designed a few.