Last week i thought i should give my pc a boost so i decided to overclock my C2Duo E7200 to 3GHz but it didn't boot after that. So i ran the defaults from BIOS & ever since my CPU fan (Cooler Master Hyper 48) is running on 3500 rpm & gets pretty noisy. Earlier it wasn't making any noise. The CPU temp. is also not high but CPU fan seems to be running constantly near 3500 rpm. I tried to update the BIOS through MSI live update but it is already the latest version. My pc specs. are Now i do need to overclock the CPU a bit but more than that i need silent PC. Please guide me as i m pretty much feeling a n00b here.