I found some kind of solution As I said, i got the bios-screen working by changing a jumper (it's a phoenix bios), since there was no option to boot from cd I inserted the hdd into an other computer, formated it, and filed it with the files I needed to install windows 98. That didn't work at first (jumper setting from hdd wrong :?, saw that later), so I did it an other way, took a pc with 1 hdd and replaced it with the one in the pc that doesn't boot from cd, and started an install of windows Xp, after the first reboot I changed the hdd again and was hoping that it would install properly. Hoping indeed, cause it seems that there isn't enough memory And since SIMMS are to expencive for what they are, I'm going to go see if someone has an old pc they don't use anymore, and use their memory And if that doesn't work, well, I guess I gonna install linux Thx for all the help!