[SOLVED] G14 Black Screen, Max Fans on AC Power
I'm posting this because I spent significant amount of time dealing with a nightmare issue on my 2021 G14, and I want to help anyone else going through the same thing. I've seen similar posts from u/VennTeaCoffee, u/sennaro93, u/Better-Factor1953, and u/Dank_Boi_619 - this might help you too.
System Information
- Model: ASUS ROG Zephyrus G14 (2021)
- CPU: AMD Ryzen 9 4900HS
- Dedicated GPU: NVIDIA GeForce RTX 2060 Max-Q
Issue Summary
My laptop was experiencing a critical failure whenever I connected the AC power adapter. About 30 seconds after plugging it in, the screen would go black, system fans would ramp up to maximum speed, and connected I/O devices (e.g., mouse, keyboard) would disconnect. Although everything worked fine when I ran on battery power alone.
I eventually isolated the problem to the integrated AMD graphics driver. The crash only happened when I had the AMD display driver enabled while connected to AC power.
What I Did to Troubleshoot
- Initial Incident: I first noticed this problem when I tried upgrading to Windows 11. The installation would fail every time, giving me a black screen with fans at full blast, forcing me to roll back to Windows 10.
- Operating System Reinstalls: Thinking it might be software corruption, I performed multiple clean OS installations:
- I reinstalled Windows 10 three times.
- I reinstalled Windows 11 four times.
- Driver Installation and Crash Trigger: On Day 1, after a fresh Windows 10 installation, my system was stable until I installed drivers. The crashing started immediately after I installed the AMD and NVIDIA graphics drivers while Windows updates were also running in the background.
- Problem Isolation: Through methodical testing, I identified the trigger. When I disabled the "AMD Radeon(TM) Graphics" adapter in Device Manager, my system stayed stable with the AC adapter connected. But the moment I re-enabled this device, the system would crash again when on AC power.
- Professional Diagnosis and Further Testing:
- I took my laptop to an official ASUS service center, where technicians reinstalled the original factory OS image.
- After their diagnostics, they told me the integrated AMD graphics card was faulty and that I needed to replace the entire CPU/iGPU assembly. They quoted me 92,000 INR for a new motherboard or 58,000 INR to replace the component on my current one.
- After leaving the service center, I installed Pop!_OS (a Linux distribution) to see if this was Windows-specific. The same crashing happened, which seemed to confirm a hardware or firmware problem.
Software & Driver Details
- Operating Systems Tested: Windows 10, Windows 11, Pop!_OS (Linux).
- AMD Drivers Attempted:
- Official ASUS-provided chipset and graphics drivers from the support website.
- Generic AMD Software Adrenalin Edition (Version 25.9.1) from AMD's official website.
- NVIDIA Driver Installed:
- Game Ready Driver Version 581.42.
- Resources Used for Downloads:
How I Accidentally Fixed It
After the service center visit, I installed Windows 10 again Then I accidentally fixed the issue by following a specific driver reinstallation procedure:
- In Device Manager, under Display adapters, I selected the "AMD Radeon(TM) Graphics" adapter.
- I clicked "Uninstall device".
- In the confirmation pop-up, I left the "Delete the driver software for this device" checkbox unchecked. I used to remove the driver software entirely prior to this attempt.
- When I confirmed the uninstall, the driver was removed and then immediately reinstalled itself.
My Theory: The issue wasn't actually a catastrophic hardware failure, but rather a deep-level software conflict or corrupted driver state. This specific uninstall method, which kept the base driver files while forcing a re-initialization, seems to have reset the communication between the iGPU, dGPU and power management system.
Stability: Since I did this procedure, my laptop has been perfectly stable for 31 days with zero crashes or issues.
Current Status: Resolved and Optimized
My laptop is now fully functional and stable. What the service center diagnosed as a hardware fault appears to have been a complex software driver conflict, which I've now resolved. I have the integrated AMD graphics adapter enabled, and my system is stable on both battery and AC power.
Performance Optimization: I also realized a significant performance boost by switching how I connect my external display,from the iGPU-linked HDMI port to the dGPU-linked USB-C port.
- What I Used Before: HDMI (connected to the iGPU), which gave me 90-130 FPS in Valorant.
- What I Use Now: A USB-C to DisplayPort adapter (amazon.in/dp/B09G9HB5TQ), which connects directly to my NVIDIA dGPU.
- Result: This switch has reduced system heat and significantly boosted my performance. I now get 150-180 FPS in Valorant at 2560x1440 resolution.
