Build & Upgrade · Checklist
First PC build checklist: parts, tools and the mistakes to avoid
By Tiny · how I pick
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A first PC build comes down to three things:
- Get the parts list right.
- Confirm everything fits before you buy.
- Run a short check before you press the power button.
Do that and your first build is a manageable weekend project. I'm putting together an AM5 build for local AI myself, and this is the list I'm working from.
Words you'll see in this guide
- CPU: the processor, the main chip that runs everything. It can run AI models too, just slower than a graphics card.
- Socket: the spot on the motherboard where the CPU sits. The CPU and board must use the same type.
- PSU: the power supply, the box inside the case that turns wall power into power every part can use.
- NVMe SSD: a small, fast storage drive that plugs straight into the motherboard. Much quicker than a hard drive or SD card.
- BIOS / UEFI: the settings screen built into a motherboard that runs before the operating system starts.
- XMP / EXPO: a one-click setting that runs your RAM at the speed printed on the box.
- Memory training: a first-boot process where the motherboard tests and tunes new RAM. It can take several minutes.
The parts you need
- CPU. Some come with a cooler in the box. Many higher-end ones don't.
- CPU cooler, if your CPU doesn't include one. An air cooler is simpler for a first build than a liquid cooler.
- Motherboard that matches your CPU's socket, for example AM5 for current AMD Ryzen chips.
- RAM of the type your motherboard takes. DDR4 and DDR5 don't fit each other's slots.
- Storage: an NVMe SSD for the operating system.
- Graphics card, needed for gaming and local AI. Optional for office work if your CPU has built-in graphics.
- Power supply (PSU) with enough wattage and the right connectors for your graphics card.
- Case that fits your motherboard size and graphics card length.
- Operating system: Windows, or free Linux (see which Linux distro to use).
The compatibility checks
- Check that the CPU socket matches the motherboard socket.
- Check that the RAM type (DDR4 or DDR5) matches the motherboard.
- Check that the graphics card fits the case. Cases list a maximum card length.
- Check that the cooler's height fits the case, or that a liquid cooler's radiator has a place to mount.
- Check that the power supply's wattage and connectors match the graphics card's recommendation.
- Check BIOS support. A newer CPU may need a BIOS update on an older board.
The free site PCPartPicker checks most of these for you. Put your whole parts list in before you buy anything.
The tools
- A #2 Phillips screwdriver, ideally magnetic
- A flashlight or phone light for the dark corners of the case
- Zip ties or velcro straps for cables
- A USB stick of 8 GB or more for the Windows or Linux installer
- Your motherboard manual. It's the most useful tool in the box.
Browse PC screwdriver kits on Amazon Browse USB sticks on Amazon
Check these before you press power
- Motherboard standoffs only where the board has screw holes
- The 8-pin CPU power cable connected, near the top-left of the board
- The 24-pin main power cable clicked in
- RAM latches clicked, with sticks in the slots the manual recommends
- Graphics card latched, with all its power sockets filled
- Cooler fan plugged into the CPU_FAN header
- Monitor plugged into the graphics card
- The switch on the back of the power supply turned on
If the screen stays black, that's normal at first. New DDR5 systems can show a black screen for several minutes during memory training on the first boot. The no-display fix guide walks through it if it lasts longer.
Ten mistakes beginners make
- Forgetting the 8-pin CPU power cable
- Plugging the monitor into the motherboard instead of the graphics card
- RAM not fully clicked in
- Leaving the plastic film on the cooler's base
- Buying DDR5 for a DDR4 board, or the other way around
- A graphics card too long for the case
- Skimping on the power supply
- Panicking during the first boot's memory training
- Forgetting the rear I/O shield on boards that don't have it built in
- Never turning on XMP or EXPO, so the RAM runs slower than its rated speed
Upgrading instead of building from scratch? Start with PC upgrade parts.
Quick answers
What parts do I need to build a PC?
A CPU, a CPU cooler if one isn't included, a motherboard, RAM, an SSD, a power supply, a case, and an operating system. Add a graphics card for gaming or local AI.
Is building your first PC hard?
It takes care more than skill. Most problems come from a part that doesn't fit or a loose cable, and a parts checker plus a pre-boot checklist catches nearly all of them.
What tools do I need to build a PC?
Mainly a #2 Phillips screwdriver, a light, some cable ties, and a USB stick for the operating system installer.
Your next step: set your budget with the PC build budget calculator.
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