well.. so far I've built 3 computers and I've already gotten bad ram and a mobo that was doa.
And they were on the same build too. Damn I was pissed off since it took like a week or so to get the mobo replaced.. and then when I finally get everything working my games crash. So then I figured it was the ram.. well another week of waiting. (obviously they wanted me to send back the whole 2x 1gb kit even though only 1 stick was bad)
But I'm pretty sure I've just had some bad luck, usually there shouldn't be any problems with hardware being doa.