Hi, I am such a newbie; please excuse anything that makes me sound like an ignoramus. I have a Dell Dimension 8400, Win XP Home SP3, Pentium 4 (3.00 GHz), 3 GB Ram. My computer has been terribly noisy recently. From what I gleaned on the posts here, I ran the diagnostics. It told me all was working fine. I know this is not true! I ordered a new fan--refurbished. I just installed it. It is not quite as loud now, but still fairly noisy. Is there anything else I could change out to reduce the noise? Could the cause of the noise be something different? TIA, Georgia