My computer is making a ticking noise--like the one that is made when a key is stuck--and then freezes up. I wobbled each key to make sure it isn't in fact a stuck key. I tried to CtrlAtDel but that doesn't show or do anything. I am left no choice but to power down with the power button. When the computer reboots, the noise is gone and everything is back to normal. It has happened twice in the last hour. Any ideas? Did a Google search and hard drive dying came up. Not sure this is the sound those posts were describing though.