Well, it all started when i woke up one morning, look at websites, etc when i tried to download a small pdf file. I was told i was out of hd space, impossible because 1. it's a pdf 2. i remember having at least several gbs. I check my hd space. It shows 0, I tried deleting files and to my dismay my hard drive space slowly filled itself without any running applications. Immediately i began locking down my computer, locking down security preferences, and the one thing that tipped me off was when i tried to restart. Window popped up saying "One apple user is connected to your computer. Are you sure you want to disconnect?" I immediately went to my sharing preferences and basically blocked out everything. In the end it was Personal file sharing under the firewall tab that allowed him to connect. (<- Don't leave that on at all.) Now i've changed my router admin password, wifi password, user password, run clamx (detected nothing....), running little snitch, and i turn off wifi before i go to sleep. But still paranoid, going to ask a friend who has leopard family pack to install that on my computer. There's only one thing i'm really worried about. How easy is it for a hacker to run a keyboard logger in the background and send the information without me knowing it? As far as i can tell, he was able to fill my hard drive and maybe mess around with my monitor. It had a weird problem where the monitor was only useable for a few seconds before the screen image began to dissolve.... Any help would be appreciated.