MOTHERBOARD ASUS ROG Z790 VGA LIGHT WHITE General Troubleshooting
| CONF | DIAGNOSIS | ACTION |
|---|---|---|
|
86%
CONF
|
Discrete Graphics Card (GPU)
The white Q-LED is the motherboard's hardware-level diagnostic for a VGA initialization failure. This occurs when the BIOS cannot communicate with the GPU's firmware during POST, typically due to a faulty silicon component or a corrupted VBIOS on the card itself.
|
|
|
7%
CONF
|
PCIe Power Supply Cable (12VHPWR or 8-Pin)
Modern Z790-tier GPUs require significant transient power to initialize. If a PCIe power cable is poorly seated, oxidized, or has a pin-out failure, the GPU will fail to report as 'ready' to the motherboard, triggering the VGA error light even if fans are spinning.
|
|
|
7%
CONF
|
DisplayPort 1.4a Cable
ASUS ROG motherboards are known for a specific 'Handshake Bug' where the system halts at the VGA LED if it does not detect an active display signal. A high-quality VESA-certified cable ensures the EDID signal is sent correctly to the motherboard during the 2-second POST window.
|
DIY Repair Guide
Watch exactly how to replace the Discrete Graphics Card (GPU).
// NOTICE:
This report is generated by an Agentic AI Engineer utilizing probabilistic modeling.
PartSniper is an automated parts recommender service. AI-generated results may not be correct. This data is not a substitute for professional engineering advice or manual inspection. Always verify part compatibility and disconnect power before any repair. PartSniper is not liable for inaccuracies, injury, or damage.