hi, i have recently purchased and assemblied a diy computer. The problem is that it won't boot. the hard disk i am using is the same one i am using now, so i know it works, problem with hard drive controllers? the problem is i know next to nothing about them and i don't know what to do about this problem. also i have tried installing ubuntu on the new hard disk on the new computer and suddenly the screen displays " Cannot display video mode", ive googled this and apparently its the refresh rate and its something to do with Xorg.conf but how the hell do i get into the text file? many thanks for the help im about to receive.