thats exactly what he said. he is using an xp2600-m. noremacyug besides the processor what other components did you install in addittion to the old components? was the network card the same as the last hardware configuration you had? what new IDE devices are there?
microbell is going to say this anyways so i will save him the trouble
.....remove the motherboard from the case and put it on a flat surface on an anti-static bag, styrofoam block, ect. install only 1 stick of RAM, the CPU, and the video card so you can eliminate all the other factors. even if you still get the problem you can narrow down the cause.
btw, does it detect your processor speed correctly? have you tried to boot into safe mode without networking? what happens if you disconnect the network cable and boot up?