Please, a horrendously condensed paragraph may save space, but it's a nightmare to work out your specific issues from it.
1) Refresh Rate - You could try xorgsetup if you're not sure of the values. But as egag says, try lifting the values from your Fedora configuration.
2) Colour Depth - Check under 'Section "Screen"' in /etc/X11/xorg.conf and make sure that DefaultDepth is 24 - *not* 8 or 16.
4) Boot straight into X:
http://wiki.linuxquestions.org/wiki/...ight_into_X.3F
(Do this *after* you've finished getting X working properly)
5) Sound:
Either: Your sound card is loaded, so you need to run either 'alsamixer' in the terminal, or Kmix in KDE (KDE deals with its volume separately from the Alsa volume settings).
Or: Your card needs to be configured. Try running 'alsaconf' as root.
(To get more detail on your card and other PCI devices, run /sbin/lspci)
6) Y! Messeger:
Never used Yahoo's client - I'd recommend Gaim instead, which comes with Slackware.