1. agpgart is the driver for your agp socket for your graphics card
2. try running "alsaconf" as root and see what happens
3. if 2. doesn't work, chances are you haven't installed alsa correctly, re-compile and install alsa again - or just use the alsa pckages supplied with slack:
Code:
upgradepkg --reinstall /path.to.cdrom/slackware/l/alsa*