For me it was when I first got my first computer at a young age. Bday present from my parents.
They figured a computer would be a good way to feed my extreme curiosity in all things. This was early/mid nineties
Manually trying to open every single file inside it to see what's in it. Sometimes editing files to see what would happen and then figuring out why it would happen. Fucking up the OS more than once obviously.. This was way before there were proper search engines
Went to the local (nearest) library to rent some books about computers / operating systems. The entire library had like a single shelf with some old computer related books, most of them written in English. From here I 'borrowed' an 'Encarta' encyclopedia on CD to read and explore. Also, the OS on my computer was configured in English so I had to get myself an English to <native language> dictionary and tried to decipher all the words that were used.
So yeah, I'd say my parents gave my first inspiration.
After a while I found out my neighbor was quite handy with computers, he introduced me to batch file scripting in Windows. Awesome