Laptop Problems Who Can Helps?

My old laptop 10 years old constantly changes the colors when booting up

The color? Sounds like a display defect or loose contact. A couple more info (pictures for example) would be helpful.

Defective graphics card or defective cable connection between graphics card and display.

He makes an RGB test 😁.

Seriously, could lie on the TFT or on the cable to the monitor or the graphics chip.

The first thing to test when connecting an external monitor, the error wanders, it is probably the graphics chip.