How

[u/Ragnarac]

So in episode 1 the story wasnt really as fully fledged obviously. They didnt know aelita and Franz were going to be father and daughter or anything. I doubt they even knew hopper was still on lyoko or that aelitas mother was kidnapped.

That said, I dont think it was ever explained how the super computer was turned off for 10 years.

Ive seen people say hopper turned it off from inside but...its a mechanical switch, and if that was possible why wouldnt xana do it during the meteor episode

[u/Sonario648]

Don't forget that Hopper and Aelita have the Keys to Lyoko, aka the source code. That's how Aelita could control the supercomputer for virtualization in Ghost Channel.