Computer not booting after new case fans installed.

Troubleshooting Guide: Computer Fails to Boot After Installing New RGB Case Fans

Upgrading your PC’s aesthetics with new RGB case fans can be an exciting enhancement. However, sometimes, this process can unexpectedly lead to startup issues. If your computer refuses to boot after installing new fans, and you notice that some RAM sticks briefly light up but then go dark, you’re not alone. This article provides a comprehensive troubleshooting guide to help identify and resolve common problems that arise during such upgrades.

Understanding the Symptoms

The computer does not power on or boot into the operating system.
Two of four RAM modules briefly illuminate before losing power.
No other signs of POST (Power-On Self-Test) completion.
Rechecked connections and cabling with no resolution.

Possible Causes

Connection Issues or Short Circuits
Power Supply Limitations or Disconnections
RAM Seating or Compatibility Problems
Motherboard or BIOS Conflicts
New Fan Installation Impacting Airflow or Hardware Positioning

Step-by-Step Troubleshooting

Power Cycle and Reset
Turn off the system and disconnect power.
Press and hold the power button for 10-15 seconds to discharge residual power.
Reconnect the power supply and try powering on again.
Check Connections Carefully
Ensure all power cables, especially CPU and motherboard 24-pin/8-pin connectors, are securely connected.
Verify that the RGB fans are plugged into appropriate headers and are not causing short circuits.
Isolate the New Fans
Temporarily disconnect the new RGB fans.
Attempt to boot the system with existing fans or minimal hardware configuration.
If the system boots normally, the new fans or their connections may be the issue.
Test RAM Modules Individually
Remove all RAM sticks.
Insert one RAM stick at a time and attempt to boot.
Test each slot and module to identify faulty memory or seating issues.
Check for BIOS Updates
Ensure your motherboard BIOS is up to date, as new hardware can sometimes require firmware updates.
Refer to MSI’s official support site for the latest BIOS version for the MSI B840 Gaming Plus Wi-Fi motherboard.
Inspect Motherboard and Hardware Placement
Examine the motherboard and surrounding components for signs of physical damage or bending.
Confirm that all components are properly seated, especially if movement during fan installation was involved