I had a replaced my Mobo & Cpu and now it won't reboot. I orginally had a AMD 450 and I wanted to upgrade. I bought a Mobo combo on Ebay, P4 2.4 Ghz Prescott with a ECS Mobo. I also had bought 2 sticks of 512 ddr 333. The old mobo wasn't working that well, it's a long story....powersource blewup and disabled some parts of the mobo. I install the new hardware and the modem and video card. Now, it indicated that there was no OS detected. It also says "Failure to Boot Disk, Insert System disk and press enter". WTF? THe last time I upgraded the mother board, everything went fine. I made a windows boot disk and it tried to reinstall windows xp. It won't work. Any ideas?