CPU not seated correctly

Symptoms

• System won't POST after a CPU installation or reinstallation
• Bent pins visible on the CPU (AM4/AM5) or motherboard socket (LGA)
• CPU socket lever won't close smoothly or feels like it's meeting resistance
• This happened during a new build or a CPU swap

Likely causes

• CommonCPU placed in the socket with incorrect orientationCPUs have an alignment notch or marker that must line up correctly.
• CommonSocket lever not fully closed or latchedAn improperly closed lever can prevent proper contact even if the CPU looks placed correctly.
• PossibleBent pins on the motherboard socket (Intel LGA) or CPU (AMD)This can happen from mishandling and needs careful, patient correction.
• PossibleCPU cooler mounting pressure uneven, indirectly suggesting a seating issueSometimes what looks like a seating problem is actually cooler mounting.

What to do

1. Power down and remove the CPU cooler to inspect the CPU and socket directly.
2. Check the small alignment marker (a triangle or notch) on the CPU matches the corresponding mark on the socket.
3. Inspect the socket (or CPU pins, depending on brand) closely under good light for any visibly bent pins.
4. If pins are bent, very carefully and slowly straighten them with a fine, flat tool, working patiently rather than forcing anything.
5. Reseat the CPU gently, letting it drop into place under its own weight rather than pressing it in.
6. Close the socket lever fully and firmly until it clicks into its locked position, then reinstall the cooler.

Tools and parts

• Fine flat tool (like a mechanical pencil or plastic pry tool) for pin straightening, if needed

When to call a pro

If pins are significantly bent or you're not comfortable straightening them yourself, a PC repair technician can attempt the repair with proper tools and experience.

Safety