Asus Motherboard Error Code 99: 4 Effective Fixes

Asus Motherboard Error Code 99

Bothered with the Asus motherboard error code 99? Then this is just the article you are going to need.

Asus is one of the best companies when it comes to computers and hardware components for the same. And their portfolio of products extends much further than just these.

Due to the premium quality of the products that this company out of Taiwan sells, millions and millions of people buy and use them around the world.

No matter what computer part you might need, Asus is going to have something good for you.

But the thing is that, even if the quality of the Asus products is very good, still, you might face issues with these every once in a while.

This particular one is something you might face if you use an Asus motherboard. But you need not worry, as you will be able to resolve Asus motherboard error code 99 on your own.

The instructions in this article are going to help you do so.

Some of the Reasons Behind Asus Motherboard Error Code 99

Even if you will be able to fix this issue all by yourself, still, it is not going to be as easy and straightforward as it might seem.

Asus motherboards have very complex semiconductor circuit designs. On top of that, there is a lot of high-level software which works through that.

All of these make the whole thing very delicate, especially when you want to tweak it.

Because that is what you would be doing when you try to fix the Asus motherboard error code 99.

As such, you might unknowingly inflict damage on the motherboard or related software.

To avoid that, what you will need is a sound understanding of what the issue is and why it is occurring.

With that, not only will you be able to avoid any of the various adverse effects, but you are also going to find the instructions in the solution very easy to understand.

As the instructions that we have given here are very technical. Because of which a person who is not that tech-savvy might find it rather simple to understand and implement.

This is what we have covered in this section of the article.

Technical Issues behind Asus Motherboard Error Code 99

If we have to point to a rather significant cause of this error, then that is definitely going to be an issue with the processor.

The processor of your computer, which is mounted on your Asus motherboard can go wrong.

Usually, it is obvious physical damage due to heating, but issues can be there at deeper levels as well.

Other than the processor, it is the hard drive that you have, which can damage your Asus motherboard. Just like the processor, the hard drive is also in contact with the motherboard.

Thus, any hard drive issue can spill over to the motherboard and give you errors.

Then there is the Master Boot Record, or in short the MBR which contains valuable information. Like details regarding the partitioning of the hard drive. And such other important ones relate to the system boot.

Any issue with this can trigger this error code, which you will get as an error message on your system.

And lastly, it is the settings of the CMOS which can cause this problem with your Asus motherboard. In turn, that is going to cause problems with proper booting of the system.

So, after covering all the probable causes of this particular error code issue. Let us now take a look at how we can go ahead and fix this problem.

4 Ways to Troubleshoot the Asus Motherboard Error Code 99

In this section of the article, we are going to cover 4 different methods to help you resolve this issue.

Each solution is for one particular cause of the error. And if you can identify what that is in your case, then you can go and apply that solution right away. But if you do not have that information, then also there is no problem.

Apply these methods one after the other, and you will be able to fix the issue.

Repair any Problem with the Master Boot Record (MBR)

If there is an issue with the Master Boot Record of your system, then it can cause this motherboard error code 99.

In order to fix the problem and make it work properly, here are all the steps you need to take:

  • First, you will have to install the recovery USB or the original DVD as would fit your system.
  • After you have done that, look for the Repair Your Computer option to click on it. You will find it on the Welcome Screen.
  • When that window comes up, select the Troubleshoot option, and then the Command Prompt.
  • Now, once you are in the Command Prompt window. Enter the commands bootrec/FixMbr, bootrec/FixBoot, bootrec/ScanOS, and bootrec/rebuildBcd in this particular order. Make sure to hit the Enter key after each command.
  • Each command would take 2 to 3 minutes to complete its operation. After that, take out the USB, or the DVD.
  • Finally, type in the Exit command to come out of the Command Prompt window.

This is going to fix the MBR of your system to make your Asus motherboard function again.

Reset the CMOS

Correct settings of the CMOS are absolutely critical to the proper functioning of the system. Any issue with this can manifest itself as the motherboard issue.

That is why to fix incorrect settings of the CMOS and get your Asus motherboard working again, you will have to reset the CMOS settings, for which there are 2 methods.

Through the CMOS Jumper

To reset the CMOS settings with this method, here are all the steps that you will need.

  • Turn your computer off first.
  • After that, take out all the cables which connect to your computer. Then open up the motherboard of the system.
  • Look for the CMOS jumper and once you find it, detach all the 3 pins from that position.
  • Attach the CMOS jumper in the 2-3 position, which was previously in the 1-2 position.
  • Leave it like that for about 5 to 7 minutes and then attach it to the 1-2 position once again.
  • Power up your system and go to the BIOS screen in order to bring back the Factory Default settings.

Thus, you have reset all the CMOS settings.

The Battery Method

This one is going to be relatively simpler than the previous one. As it does not involve anything as delicate as tweaking around with semiconductor components.

The following steps are the ones that will help you do that.

  • Detach all the peripheral devices that are there with your computer system.
  • Take the power cord out after this to completely cut the power off from the system.
  • Open the cover of the device and look for the battery on the motherboard. It is going to be wire-connected with either the horizontal or the vertical holder.
  • Pull out the battery from the motherboard and wait for 3 minutes or so.
  • Then, just reconnect the battery and put the cover of the device back on.  
  • Finally, plug your system back to the source of power and switch it on.

This is very likely going to fix the problem that you are facing with the Asus motherboard.

Detach the Hard Disk Drive

As we mentioned previously in this article, that a problem with the hard disk drive of your computer can also cause problems with the motherboard.

So if that be the case, then you will have to detach it all together in order to fix this issue.

Here are the steps that you are going to need for that.

  • Take out the battery from your computer system and with that, the service door.
  • Now, from the cabinet which secures the hard drive, remove all the small screws.
  • To disconnect the hard drive from here, you will have to slide it out of its position.
  • You will find that cables will be there, which connects the system with the hard drive. Remove all of those to disconnect the hard drive totally.

Thus, by removing the faulty hard disk drive, you will be able to fix the Asus motherboard error code 99.

Put a New Processor In

If it is the processor itself, mounted on your Asus motherboard, that is causing this issue, in that case, you will have to remove that and put a new one in its place.

Trying to fix up the faulty processor is not a feasible solution in any way. So, here are the steps that you will need to mount the new processor on the motherboard.

  • Dismantle the cabinet of the CPU and look for the cooling system for it.
  • Now, take out each and every cable that is in connection with your system through the cabinet.
  • Pull the CPU socket cover out and with great care, detach the processor from the motherboard. Make sure that all the pins are absolutely intact.
  • Mount the new processor onto the motherboard through the socket after that.
  • Put the socket cover back on again and layer the thermal paste over that.
  • After this, attach the CPU cooler plug and all the other plug attachments, just like they were before.
  • Finally, put the CPU cabinet cover back on and plug it on to the source of power from there.

Now, after you boot up the computer, and reinstall the operating system, check whether the issue is still present or not.


After going through this article, you now will be able to successfully resolve the Asus motherboard error code 99.

But as you might have seen that there are a few processes which are going to be rather delicate.

That is why it will be best to have professionals handle all of that. Something which you can only get from a great tech support service.

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