Often a dead graphics card can be brought back to life by reflashing the appropriate VBIOS image to its ROM chip. Symptoms: Graphics card fans spin but no output. Here is a video by MV TechLabs on How to set up and use MATS.Here is a written guide on how to use MATS Nvidia Memory Testing Guide.Nvidia has a proprietary software tool called MODS (Nvidia MOdular Diagnostic Software) which has a standalone VRAM test called MATS. mining with badly cooled cards) or in some cases the VRAM was overvolted which degrades the silicon over time.
It could be that it's a manufacturing error or VRAM kept running too hot for too long (i.e. Why VRAM fails in the first place? Well, there are multiple possibilities. When video memory fails -depending on the damage-, can cause crashing, artifacts, un-stability, or just prevents the GPU from outputting a video in the first place. Symptoms: Graphical output is corrupted or missing or the monitor outputs backlight with no picture. GeForce RTX 2000 series, GeForce GTX 1600 series
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