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How to tidy cables, reassemble your PC case and connect peripherals

The final hardware steps to a completed PC build

With all the internal components installed and connected, congrats: you basically have a custom built gaming PC, albeit one that won’t be functional until you install Windows. There are also just a few more details to attend to first, including a spot of cable management (optional, but highly recommended) and putting your opened-up case back together.

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Why bother with tidying cables? The risk of loose wires restricting airflow tends to be exaggerated at best, but it’s not solely for aesthetics either. Keeping everything neat will make it easier to open and close your case, speed up any upgrades or troubleshooting you might need to do in the future, and can even prevent irritating sounds cause by plastic cable headers vibrating against the PC’s chassis. Or, worse, hitting a fan as it spins.

With a little intuition, you’ve probably been using some cable management techniques already, like passing PSU cables through routing holes to get them into the motherboard chamber. But even if your PC currently resembles a box of neglected Christmas lights, now that you know where all the cables need to plug in, there’s no shame in going back, rerouting and reconnecting them for a cleaner build. Here are some general cable tidying tips, as well as how to close up your case and get all your peripherals ready for that final push into OS installation.

A PCIe power cable being held up next to Nvidia's RTX 30 series power adapter.

How to build a PC: cable management guide

Routing channels

These provide a handy guide for where to direct your cables. The gold standard of a routing channel is that which includes its own fastening mechanism, like Velcro straps – a reusable fastener like this makes it really easy to remove and replace cables later, so make full use if your case includes them.

The cable routing channels inside a gaming PC case.

Simpler channels may be easier to miss, but they’ll be marked by small metal loops. These allow you to use cable ties (a.k.a. zip ties) to secure a bundle of cables in place by tying them down to those loops, like chaining a bike to a railing. Most respectable cases will include a few freebie cable ties for you, but if you want more, they’re dirt cheap to buy online or in pound shops/dollar stores.

A bundle of cables inside a gaming PC that have been tidily cable-tied to a loop on the chassis.

Generally, effective use of routing channels will help you avoid criss-crossing wires or letting them come in contact with sensitive areas like the motherboard. Channels are your friends.

Routing holes

The other nice thing about routing channels? They lead you to routing holes, cutouts around the internal chassis that let you pass cables in and out of the main chamber.

If it sounds like I’m explaining the obvious, I am a bit, because it’s practically impossible to avoid using these routing holes in a PC build. That said, it is possible to use the wrong ones for the wrong cables, which can lead them stretching, tangling, or otherwise just getting messier than they need to be.

One of several cable routing holes in a gaming PC case.

For instance: the CPU power cable should always thread through the routing hole at the top-rear corner of the motherboard tray (pictured), while the honking great 24-pin power cable is best fed through a hole next to the motherboard’s right edge. Pay special attention to the routing holes along the base of the motherboard, too – if you find the appropriate header for a cable first, you can identify the nearest routing hole and thread it through that one, avoiding a situation where you have multiple overlapping cables squished in that awkward little space.

Just stuff the cables under the PSU shroud, basically

Meh, it’s hardly elegant, but that empty space under the PSU shroud? Between the PSU and the HDD cage? That’s prime storage space for excess cabling. It’s best done once all the more skillful cable tidying is complete, especially any fastening with straps or cable ties, but the rest you can simply stuff inside that gap.

A bunch of PC cables stuffed into the space beneath the case's PSU shroud.

The PSU gets its own airflow from under the case, so it doesn’t matter that you’re blocking off cooling from the front intake fans.

The inside of a gaming PC, after cable tidying.

How to reassemble your PC case

"Reassemble" is perhaps a strong word in this context, as all you really need to do now is replace the PC case’s side panels that you removed earlier.

Step 1: Place the PC down flat on its left side, and grab the right side panel. Make sure it’s aligned with any latches or hooks that will keep it in place, then lay it down flat. If it won’t go flat, take a look inside to make sure that no lingering cable bundles are getting in the way.

Step 1 of reassembling a PC case: Lay the PC down flat, on its left side, then reattach the right side panel so that it sits flush.

Step 2: Once the right side panel is in place, insert and tighten the thumbscrews at the back. These don’t need to be screwdriver-tight, just nice and firm.

Step 2 of reassembling a PC case: Tighten the thumbscrews at the rear of the panel to secure it.

Step 3: Flip the PC onto its freshly-covered right side, and place the left side panel (or window) back on. Just as you did before, secure the panel/window in place with any thumbscrews or other locking mechanisms it uses.

Step 3 of reassembling a PC case: Reattach the left side panel and, as with the right panel, secure it with the rear thumbscrews.

The Logitech Aurora Collection, including the G705 gaming mouse, G715 keyboard and G735 headset.

How to build a PC: connecting peripherals

Tantalisingly close to the finish line now. At this point you can go ahead and hook up your mouse and keyboard, network cable or adapter, and your monitor.

Step 1: Connect any USB peripherals. This step has the distinction of being the most obvious and self-explanatory step in our ten-page guide.

Connecting various USB peripherals, like a mouse and keyboard, to a gaming PC's rear I/O panel.

Step 2: Plug in an Ethernet cable if you’re using one, or a USB Wi-Fi adapter. Or, if your motherboard has onboard Wi-Fi, it probably came with a little dual-wired antenna. You can install this by screwing both cables onto the I/O panel’s matching golden connectors.

Connecting an antenna to the Wi-Fi connectors on a gaming motherboard's I/O panel.

Step 3: Connect your monitor to a display output on the graphics cardnot on the motherboard I/O panel. A DisplayPort connection is best for gaming, as it supports higher resolutions and faster refresh rates than HDMI, and you should receive a DisplayPort cable with any halfway decent gaming monitor.

Connecting a DisplayPort cable to the rear outputs of a graphics card, which has been installed inside a gaming PC.

Aaaaaand you're all sorted. Ready for your PC's first boot?

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About the Author
James Archer avatar

James Archer

Hardware Editor

James had previously hung around beneath the RPS treehouse as a freelancer, before being told to drop the pine cones and climb up to become hardware editor. He has over a decade’s experience in testing/writing about tech and games, something you can probably tell from his hairline.