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Asus notebook USB flash drive startup detection invalid signature
The solution steps are as follows:

1. Find a good monitor and connect it to the computer.

2. Boot test. If there is no pink vertical bar on the external monitor, the problem lies in the notebook screen. It may be that the screen is broken or the screen line is in poor contact, which belongs to a hardware problem and cannot be solved by itself. It is recommended to find a professional to repair it.