Are you using RHEL or F9. (If F9 was supposed to be an abbreviation for fine, then please see the forum rules about using text speak--in addition, it tends to annoy people, causing them to competely ignore your posts.)
If you have RHEL5, generally, one has a support contract--that might be the best thing to do, start by calling them. There really isn't enough information in your post for anyone to really help. If the sound was a click at regular or random intervals, you may have a disk issue. Logs might give a clue, or possibly there was an update that broke something.
@Arimus, quite frequently, people do post RH or CentOS questions here--it's often a good place to get answers, actually, since these forums are much busier than CentOS, and some people here only use Fedora because their work requires them to use CentOS or RH.
However, it does go in Linux Chat as Leigh pointed out, since it's not Fedora. @the OP, don't feel badly though, many, many people do the same thing, since folks tend to think of Fedora and RH as being the same.