Why the CPU graphics is while and black from task manager?

This is because you are in dark mode.

1.Windows Theme: The Task Manager interface can change color based on whether you are using a light or dark theme in Windows. If you have set your system to a dark mode, for example, the graphical elements might appear white against a black background.
2.Driver Issues: If the graphics performance data is not displaying correctly or is appearing as a solid color, it could be indicative of an issue with your graphics drivers. Outdated or corrupted drivers can cause abnormal behavior in Task Manager.
3.Graphics Hardware: If you have multiple graphics processing units (GPUs) installed (for instance, an integrated GPU and a dedicated GPU), there may be confusion about which GPU's data is being referenced or shown.

When the integrated graphics are not actively being used or are in an idle state, they appear greyed out. This means there's no load on the GPU, which is perfectly normal if you're not running any graphics-intensive applications.

The graphical representation in Task Manager’s Performance tab may appear in grey or white when the CPU graphics usage is low or inactive. If your CPU isn’t being heavily utilized, or if there are no graphics-intensive applications running, the graph may remain mostly flat or show minimal activity.

If your system has both an integrated GPU (like Intel HD Graphics) and a dedicated GPU (like NVIDIA or AMD), it’s possible that only the dedicated GPU is being used. This often happens in laptops configured to use the dedicated graphics card for applications that demand more graphical power.