Common PC Building Mistakes That You Should Be Aware Of

Common PC Building Mistakes

Trying to build your own computer isn’t the hardest thing you’ll ever do, but to say there’s nothing that could go wrong wouldn’t be accurate in the least bit. There’s actually a lot that could get in the way of you and a completed build. Luckily, more often than not it’s going to be a simple mistake that can be fixed both quickly and easily… But, sometimes it’s not. Let us discuss about Common PC Building Mistakes.

1. Buying incompatible hardware

One of the Common PC Building Mistakes to make when building your own computer is buying incompatible hardware.

It might be that your CPU is not compatible with your motherboard, or your motherboard simply doesn’t support the type of storage you bought. Or maybe you bought a CPU cooler that’s too big for your case. Regardless, buying incompatible hardware is a serious headache that can be avoided by doing some research before hitting that buy button.

I’m not just talking about the basic “will it work together?” type of compatibility, but all types. From the physical size of components to power consumption, and even the amount of storage drives you want to run, all facets of your build must be considered!

2. Installing the CPU wrong Common PC Building Mistakes

This is more common than you might imagine. A lot of people just aren’t aware that processors must be installed in a certain orientation. This is no fault of your own, it’s just never made super clear anywhere unless you’re reading absolutely every bit of documentation you receive with your hardware.

Luckily, it’s really easy to know which direction to install your CPU. All processors will have some kind of marking on one of the corners, on AMD chips it’s a gold arrow usually found on the bottom-left corner. That marking has to be lined up with the marking you’ll find on your motherboard’s CPU socket, often on the socket’s “load plate” or the metal part that locks your CPU down – sometimes this indicator is found on the board itself.

3. Forgetting the CPU power connection

Another extremely common mistake to make is missing the CPU power connection. This happens so often that probably 50% of new builders will run into this problem on their first build. So, if this is you, there’s definitely nothing to feel bad about.

Your CPU power connection is going to be found in the top left corner of your motherboard. Failing to hit that with a power connection will result in your build doing absolutely nothing when you try and power it on. It often requires a 6 or 8-pin connection from your PSU, it might even be marked as cpu_pwr or something along those lines.

4. Not plugging the CPU cooler in Common PC Building Mistakes

It’s pretty common to forget to plug your CPU cooler in. I know how it is, you’re excited to get your new build together, you slot your CPU, lock your cooler down… but forget the power connection that’s likely bundled into/around the fan. No worries, we’ve all been there.

You’re going to find your CPU cooler connection somewhere around the CPU socket on your motherboard. Where exactly changes per board, but it’ll definitely be around there somewhere – more than likely marked as “cpu_fan” or something similar. When in doubt, refer to your motherboard’s manual to be shown the exact location.

5. Leaving the plastic cover on your CPU cooler (or forgetting TIM)

Did you know there’s usually a little slip of transparent plastic that keeps your stock CPU cooler’s thermal paste from getting on everything? If you didn’t, well, you should probably check your CPU cooler to make sure you removed it!

Not only will that slip of plastic result in bad cooling, but in the worst-case scenario it could melt and damage your motherboard – not ideal! Even aftermarket CPU coolers will have a little slip of plastic that you have to be aware of, it’ll usually say “remove before use” in big red letters. Thankfully, some coolers come with such large covers that it would be impossible to miss.

Common PC Building Mistakes

If you bought an aftermarket cooler, did you remember to add a small dab of thermal paste (aka TIM) to your CPU before locking your cooler down? If you didn’t do that and it didn’t have any TIM on it, you have to do that ASAP. Chances are your CPU cooler came with some thermal paste, maybe in a small tube or maybe in a small bag, either way you likely have some kicking around if you bought an aftermarket CPU cooler. If not, you can pick some Thermal Grizzly Kryonaut up for less than $10.

6. Trying to slot RAM wrong / not seating it fully Common PC Building Mistakes

Almost as common as trying to install a CPU cooler wrong, is trying to install RAM wrong or not seating it fully. Installing RAM wrong can have a couple of different effects, one being that it just won’t go in the slot, and the other being it won’t take advantage of dual channel pairing. Not seating your RAM properly can end up with your build not functioning.

Similar to a CPU, RAM also has a certain way it has to be installed in the DIMM slots. If you look closely at the pins on your stick of RAM, you’ll notice that it’s not split 50/50. It’s more of a 60/40 split, right? Well, if you check out your motherboard RAM slot now, you’ll notice that it’s also split 60/40. If your RAM isn’t lined up correctly you can easily cause damage to the stick itself and/or the DIMM slot.

Beyond that, if you’re running dual channel RAM, your motherboard will have a set position for your sticks – this is important if you’re running a dual channel pair. Often times, your sticks of RAM will alternate slots, but some motherboards will have them right beside each other – this changes based on the board so make sure you’re double-checking the manual!

7. Rogue motherboard standoffs

The little metal pegs inside of your case that you mount your motherboard on are called standoffs. These should be used only where they’re needed, any extra standoffs should always be removed from your case and kept aside.

Although slightly less common than the other mistakes we’ve talked about so far, this can have very negative effects – like shorting your motherboard out.  As you can imagine, that’s not a good thing to do; at best your PC will shut itself off, at worst you could fry something.

Better to avoid that and spend the extra 5 seconds to twist out any unneeded motherboard standoffs! They might not want to come out easily, in which case I’d suggest using a pair of needlenose pliers or something similar. Or, if you’re lucky your case might come with a little tool specifically designed to remove standoffs.

8. Forgetting a connection for storage (HDD/SSD) Common PC Building Mistakes

Forgetting a storage connection is more common than you might think. All drives outside of M.2 SSDs require 2 connections, 1 from your power supply and one from the drive to your motherboard. It’s not uncommon for a new builder to only connect one of the 2 without knowing.

Common PC Building Mistakes

Another way you can run into problems related to connecting storage is not having enough SATA data cables. Typically, your motherboard will come with 2 SATA data cables which is ideal for most builds; but if you’re adding more than 2 drives then you’re going to need more than 2 cables. Luckily, you can pick up packs of 3x SATA III 6Gbps data cables for less than $10.


Those were some of the most important point that you should remember while buying a PC.

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