Clicks from a hard drive? How loud? Loud clicks are bad. A nearly inaudible clicking sound can be normal. But that is easy to check. Unplug all of the drives from the motherboard. Now try to boot. If you still cannot, the drives are not your problem. You do not need drives for the initial POST to run.
No beeps (assuming it used to) means the system is not POSTing.
Work systematically through our standard checklist and troubleshooting thread:http://www.tomshardware.com/forum/261145-31-read-posting-boot-problems
I mean work through, not just read over it. We spent a lot of time on this. It should find most of the problems.