Re: Little button
The little button that pops out the plastic piece is an expansion port built into the laptop, called the ExpressCard slot. Here's the image and explanation from the manual for the Vostro 1000.
1) hard drive — Stores software and data. For more information, see Hard Drive and Hard drive problems.
2) ExpressCard slot — Supports one ExpressCard. The computer ships with a plastic blank installed in the slot. You can add an ExpressCard to make WWAN connectivity available on your computer. For more information, see Using Cards.
3) 3-in-1 media memory card reader — Provides a fast and convenient way to view and share digital photos, music, and videos stored on a media memory card. The 3-in-1 media memory card reader reads Secure Digital (SD) card/SDIO and MultiMediaCard (MMC) digital media memory cards.
4) audio connectors (2)
5) USB connectors (2)
It does have a card reader for your digital camera, but it's next to the ExpressCard slot.
I put it all back together better than before. There\'s lots of leftover parts.