I have a 533 celeron system w/ a loud aopen 250 watts. It seems like it is making some grinding noises sometimes, but I know its not the hard drive. I mean, the PSU is basically shaking my case like crazy at times. But the system has not crashed and i haven't noticed any problems with stability though... It is about a year old I guess. It is rather difficult for me to pinpoint where the noises are coming from, its not the HSF, HD, cd burner, etc. Could the mobo make this much noise?