Problem fixed, bought a new pc. Cause the old one was slow and sounded like a jet engine xD.
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I don't know what happened exactly, but my pc freezed completely. After that i restarted it. After the restart it kept saying: Insert system boot disk and press enter to continue.

After restarting it like 10 times i finally got it to work.

Anyone familiar with this?

Greetings,
Flappah.

Yeah, happened to me before a loong time ago. I forgot how to solve it, I think you either enter the format disk or just press enter without it or something.

Sounds like you have a corrupted hard drive or at least some dodgy sectors.

The message you got was telling you that your computer had looked for an operating system on your master hard disk, but couldn't find one.

If you tried it multiple times and it eventually worked it sounds more like dodgy sectors.

I recommend running scan disk, check disk or your manufacturers disk checker software.

I had this issue once as it goes, turns out it was a dodgy SATA cable

The HDD would randomly not show up in the BIOS leading to the lovely "System disk not found" error so check the cables with spares if you have them.

I bought a new pc so the problems fixed ^^

Technically, you sidetracked the problem.

Point is, it worked.

Should have just turned it off and on again.