How do you fix a game boy color game that won't even start?

How do you fix a game boy color game that won't even start? It goes to the GAME BOY screen, and where the word NINTENDO is supposed to be, it looks like a pickett fence. Can someone help me?

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).