MacBook Pro won't boot
Hi. I have a Retina MacBook Pro (13", early 2013), with OS X 10.9.2 and FileVault enabled.
This morning I woke my MacBook Pro and connected a hub with some hard drives. One of them was an encrypted Time Machine backup disk, and as usual a pop-up asked me for the password. However mouse and keyboard froze before I could type anything (the caps lock led didn't work too), while the computer was still operative. I had to force power it off by holding down the power button. I disconnected everything from the computer and pressed the power button. The computer powered on normally; I logged into my account before booting (since I have FileVault enabled) but then I got stuck on the Apple with the spinning wheel.
I rebooted many and many times. I can boot on other drives and even networks. I booted on the Recovery HD and repaired Macintosh HD and its permissions, but it didn't work. Now, after a lot of attempts, Recovery HD has disappeared and when I power the computer off leaving it connected to the mains I can hear a very soft clicking noise (like a clock) which disappears if I disconnect it from the mains.
Can you help me? Thank you
MacBook Pro with Retina display, OS X Mavericks (10.9.2)