I've got a high-pitched whine that I can't figure out. It is there without the CPU fan and when the HDD is disconnected. That leaves me pretty much with the power supply or the MB. Details: I've just thrown some new inards in an old box to have as a web-surfer at home. Since I don't need fancy graphics or sounds, I am using an ASUS A7N266 MB w/ onboard video and sound. I have a Athlon XP1600 (which I seem to be underclocking at 1050 until I fix the jumpers). The old case has a 200W power supply and I am running a case fan and a cpu fan. My drive is an IBM Deskstar 120GXP. I know that this power supply might be a bit light (I've posted another question about that). Could it be the source of the sound? It is really high-pitched and very sensitive to where my head is located -- kind of like the hum from a crt. Any suggestions?

Its the power supply. you need at least 300 watts. If you dont your 200 watt PS will explode.

Thanks Computer man (and for your other reply to my other message). {Ignore the snide post that someone made in my name!} When it fries, will it take the mb with it? i.e. should I not run the box until I get a new one?

Maybe. If the PS dies and gives a jolt of elc. it will kill your motherboard. I would wait until you get a a new ps.

It won't do anything but die. It wont kill your motherboard. I guess in theory it's possible, listen to computer Man....