i've been living with this problem for almost a year. it isn't constant, but it's there 80% of the time. my computer makes this high pitched sound that sort of sounds a lot like a cd laser.. complete with the little clicks.
i'm fairly certain it's not coming from my cd-roms, or any of the fans. my next guess is maybe one of my hard drives? which brings me to the ultimate question.. what components are capable of making sounds outside the normal sonic prescence of a computer?
the problem seems to coincide with hard drive seeks, but that could be pure coincidence. it can somewhat be alleviated if i tilt my computer to varying degrees.. so some nights, especially exam nights, it is a maddening fight to find the balance. now i really want to do something concrete about it.. ANY suggestions on what the noise might be would help greatly. thanks!