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Installing the Motherboard in your Homebuilt Computer


Installing the motherboard in your homebuilt computer usually is pretty easy (though sometimes knuckle-busting). Basically, you just line up the board with the mounting holes and rear-panel openings, and then screw it in. (If you purchased a barebones computer kit, the motherboard may already be installed; in which case you can skip this page if you like.)


Read the Motherboard Manual

Before actually installing the motherboard, be sure to thoroughly read the motherboard manual. Sometimes it will be a paper manual, and sometimes it will be on a CD-ROM. But increasingly, the manual will only be available online and you'll have to visit the motherboard manufacturer's Web site to download it.

While reading the manual, you'll want to pay attention to the following items:


Determine Which Mounting Holes You will be Using

Determining the correct motherboard mounting holes in the computer case by lining up the motherboard.

About the only difficult part of installing a motherboard is matching up the mounting holes in the mobo with the ones on the case.

In theory, the mounting hole locations are standardized within a given form factor; but in practice, it's a rare thing to find a case and motherboard whose mounting holes exactly correspond.

More often, you will have to look at the mounting holes in the motherboard to determine which mounting holes on the case you will be using. Some motherboards come with a paper template that makes this easier.

If your motherboard doesn't come with a template, one easy way to determine which holes to use is to lay the motherboard in the case, temporarily fasten it with two screws on opposite corners of the motherboard, and use a Sharpie through the remaining holes to mark the rest of the mounting points you'll be using on the motherboard.

It's good practice to use all of the motherboard's mounting holes, but you probably won't use all of the case's mounting holes. Chances are that the case will have "extra" holes to accommodate different boards. Just ignore those holes.

Installing the Standoffs

Three kinds of standoffs: one metal clip type, one plastic push in type, and one metal screw in type

Once you have determined which mounting holes you will be using, you will need to insert standoffs in the corresponding holes in the computer case. Chances are that some of them will already be installed, and you will have to install the rest.

There are several types of standoffs, with the ones in this picture being the most common. The purpose of standoffs is to separate the back of the motherboard from the metal case.

You will first install the standoffs in the mounting holes in the case that correspond to the holes in your motherboard, and then you will attach the motherboard to the standoffs. That provides a gap between the motherboard to prevent shorts.

Sometimes the standoffs also ground the motherboard to the case through some of the mounting points, but the power supply cable will also provide a ground if the motherboard uses plastic standoffs.

If you don't install the standoffs, then you almost certainly will fry your motherboard when you try to install it. You also can damage your motherboard if you mount a standoff in a hole that doesn't have a corresponding hole in the motherboard. So be careful. Use all the holes in the case that line up with the holes in your motherboard, and no others.


A metal motherboard standoff screwed into the computer case chassis.

The standoffs are screwed or inserted into the chassis, and the mobo in turn is attached to the standoffs through the mounting holes in the motherboard. This creates a small space that prevents the back of the motherboard from shorting out against the metal case.

Again, don't be surprised if your motherboard has "extra" holes for which there are no corresponding holes in the case. This is normal. Very few cases and motherboards will match exactly. As long as you use all the mounting holes that do match, you'll be fine. (And there's no charge for the extra holes.)

Standoffs must NEVER be inserted into any of the "extra" holes, however. As mentioned earlier, standoffs installed in holes on the case that don't have corresponding holes in the motherboard can cause the motherboard to short out.

Don't over-tighten the standoffs. Hand-tight plus a smidgen is enough. Most cases are made of thin metal that can strip if you over-tighten the standoffs. Also, don't bend the motherboard. If it doesn't fit flat, then something isn't right. Figure out what's interfering with the motherboard fitting flat against the standoffs. Don't try to bend it to fit.


Install the Motherboard

Lining up the motherboard with the rear panel openings and the mounting screws

Once you have the correct standoffs inserted, lay the motherboard into the case, line up the mounting holes and the rear-panel connectors, and screw it down.

Usually, the easiest way to install a motherboard is to lay the motherboard over the standoffs slightly forward of the rear panel connectors, then slide it back into the rear panel connectors until the mounting holes line up. Make sure that you're not snagging any wires, then screw the board down.

Don't over tighten-the screws! You will crack the motherboard if you do, and then it will be useless. The screws should be snug, not excessively tight.

On the subject of tightening the screws, over the years, a few people who visited this site have told me that they watched a professional computer technician use an electric screwdriver to install a motherboard. But that's the kind of skill that comes with experience. While you're still learning, use a standard screwdriver, not an electric one. This is delicate stuff we're doing here; and once you break a motherboard, it's garbage.


Attach the Power Connectors

The hand of the person building the computer attaching the power connector to the motherboard
Finally, connect the ATX power connector from the power supply to the motherboard. This picture was taken years ago. More modern power supplies and motherboards have more conductors in the connector, but they otherwise look the same. There usually will also be an additional connector for the CPU in addition to the main power connector.

Attach the power cables now. If you forget about them and later fire up your computer while the ATX connector is not connected to anything, you may damage your computer's power supply. Most PSU's have built-in loads to protect them from damage if they're turned on with no load attached, but why take chances?

You may also have to connect power to the GPU and certain other components later on in the assembly process. But for now, just make sure that all the motherboard power connectors are attached.

If you're not sure where the connections are, read your motherboard's manual.

At this point, take a look at the motherboard and case and once again review your assembly sequence plan to see what should be installed next. In our case, the next step was Installing the Processor.

The gray-bearded author outdoors with a wild bird on his shoulder and a Buy Me a Coffee tip link


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