Prepare and assemble your first PC
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Give yourself a clear table, good light and a few small containers for screws. I like to identify the awkward headers and cable routes before fitting the bulky parts; it makes the assembly much easier to follow.
Keep the beginner’s complete guide beside this assembly sequence. Its component-by-purpose tables help you choose the basket before starting the hands-on work.
Use a stable, well-lit surface with room for the open case and parts. Keep screws in labelled containers and protect the components from static according to their instructions. Retain the packaging until the PC is working.
Download the motherboard, case, cooler and PSU manuals. Identify front-panel headers, CPU power, fan sockets, DIMM positions and M.2 fixings before a large cooler or GPU hides them.
Prepare the motherboard
- Check CPU orientation and socket instructions before opening the retention mechanism. Lower the chip into position without force.
- Install the memory kit in the recommended first pair of slots and confirm the latches engage.
- Fit the SSD with its correct standoff and fastening method, following heatsink and protective-film instructions.
- Identify the cooler’s correct bracket, thermal compound procedure and tightening sequence.
For the Peerless Assassin, select the correct brackets before applying paste and follow the tightening sequence. The front fan’s clearance over the RAM needs checking before the board goes into a cramped layout.
Prepare the header/cable map before fitting bulky parts. For the memory, follow the recommended channel positions; for storage, check the exact format and fastening.
Set up the case and route the difficult cables
Confirm standoffs match the board and remove any unwanted one under the board. Check whether the I/O shield is integrated. Fit the PSU and route the large leads while access is clear.
In the H5 Flow, route bulky leads first and leave enough slack for access and maintenance. A side panel that needs force should prompt another look at cable routing. Check whether fitting the cooler before the board would hide the CPU power connection in your case.
Connect each header deliberately
Use the board’s pin diagram for the power switch, LEDs, USB and audio. Pay attention to keyed plugs and voltage: addressable lighting and ordinary RGB are not interchangeable merely because both operate lights. Do not force a connector onto an uncertain header.
Connect cooling to the intended headers and follow fan/pump instructions. Fit the GPU in the intended slot, secure its bracket and connect the correct power lead fully. A support bracket must support the card without obstructing its fans.
Inspect before applying power
- No loose screws, tools or unwanted standoffs remain.
- CPU cooler mounting and fan connection are complete.
- Memory, GPU and power connectors are fully seated.
- Cables clear all fans and plugs are not under panel pressure.
- The display is connected to the intended output, with the correct input selected.
Follow the first-boot sequence. If there is no picture, use the display diagnosis rather than dismantling everything at once. Do not open the PSU or power the CPU without its correctly mounted cooler.
Prepare the building tools and screw organisation before assembly. Keep the PSU’s own cable set together and configure the case fan controls after the first stable boot.