Building your first PC is genuinely more approachable than it sounds — modern components have foolproof connectors that physically only fit one way, and a methodical order of assembly avoids most common first-build mistakes.
A Sensible Build Order
- Install the CPU into the motherboard before mounting the motherboard in the case — far easier to see and align outside a cramped case
- Install RAM and the M.2 SSD onto the motherboard next, also before mounting it
- Mount the motherboard into the case, then connect the CPU cooler
- Install the power supply and route cables before adding the GPU — much easier with more open space to work in
- Install the GPU last among major components, then connect all front-panel and peripheral cables
- Before closing the case, do a “breadboard test” — power on outside the case first to confirm it POSTs, catching a wiring mistake before you’ve fully closed everything up
- Ground yourself (antistatic wrist strap, or touch a grounded metal object) before handling components - Check your CPU cooler's compatibility with your specific socket - Verify your PSU has all the connectors your GPU and motherboard need - Read your motherboard's manual for the EXACT front-panel connector pinout - this varies between motherboards and is a common stumbling point
The single most common first-build mistake is the front-panel connector pinout (power switch, reset switch, LEDs) — genuinely small pins that are easy to misread; your motherboard’s manual has an exact diagram specific to your board, worth double-checking against rather than guessing.