Xbox one x “ventilation” error. Not the fan, power sup, or thermal paste. Not for diy...

If you tried all that I'm afraid it is a power brick hardware failure or processor (bad thermal paste) is overheating or the ventilator. Is the box warm? Any noise?

Following on from the previous replies, if your console is old and out of warranty and it's in a well-ventilated area and seems to be free of dust, sometimes cleaning it (internally) and replacing the thermal paste will fix that issue, but it should only be done if you know exactly what you're doing.

For example, I had an Xbox One X that wasn't overheating, but the fan was ramping up really loud at times. I cracked it open and found that the thermal paste was all dry and hard, so I cleaned it off and replaced it with some fresh, good quality paste, and the fan never ramped up loud again.

But yeah, only consider the above if the other advice doesn't work, if the console is out of warranty, and if you (or someone you know who can do it for you) know what you're doing.

Follow these tips to make sure your console can ventilate properly:

• Do not block ventilation openings on the console. Even something that seems insignificant, like a disc case, may limit ventilation. Make sure the power supply, which has a built-in fan, also has adequate ventilation. See
  
  About the Xbox One power supply.
  Note This is not applicable to the Xbox One S or Xbox One X, which have an internal power supply.
  
• Do not place the console or power supply on a bed, sofa, or other soft surface that may block ventilation.
  
• Do not place the console or power supply in a confined space, such as a bookcase, rack, or stereo cabinet, unless the space is well ventilated.
  
• Do not place the console or power supply near any heat source, such as a radiator, heat register, stove, or amplifier. Very hot heat sources can damage the console.
  
• Avoid excessively dusty environments, which can reduce thermal performance.

If your console consistently shuts down automatically due to ventilation problems, even after the console is free from clutter and no vents are obstructed, it will need service.

Follow these tips to make sure your console can ventilate properly:

• Do not block ventilation openings on the console. Even something that seems insignificant, like a disc case, may limit ventilation. Make sure the power supply, which has a built-in fan, also has adequate ventilation. Note This
  is not applicable to the Xbox One S or Xbox One X, which have an internal power supply.
• Do not place the console or power supply on a bed, sofa, or other soft surface that may block ventilation.
• Do not place the console or power supply in a confined space, such as a bookcase, rack, or stereo cabinet, unless the space is well ventilated.
• Do not place the console or power supply near any heat source, such as a radiator, heat register, stove, or amplifier. Very hot heat sources can damage the console.
• Avoid excessively dusty environments, which can reduce thermal performance.

If your console consistently shuts down automatically due to ventilation problems, even after the console is free from clutter and no vents are obstructed, it will need service.

They don't warranty xbox ones anymore

Unless you are in Australia or eu. AA they are t .made anynore

And since you opened ul the console we can neither help with self repair nor will ms repair it even paid