First of all, if you won't enter your password, they confiscate your computer.
Since I wanted to keep my computer, they opened windows explorer and searched for all JPGs and GIFs. Then they asked me, "What kind of photos am I going to find on here?" It was a female agent, and the conclusion I came to is that they're looking for kiddie porn.
I had no exciting photos on my computer, but I did have a shit-ton of boring photos so it wasted 30 minutes of my time and made me think that they think I look like a perv.