>    1. I want to change the resolution of X-windows from 16 color to 24 bit
> color.Help say that using 'alt'-'ctrl'-'+', but it doesnt work.

startx -- -bpp 24  ( you can add this line to your xf86config file to
have it start x in 24 bit as default, but I prefer just creating an
alias for the different color depths that I use.  Being a new user, I
still mess things up often, and this method leaves me some options just
in case.) I don't know why the 'alt'-'ctrl'-'+' method doesn't work. 
Doesn't work on my machine as well?
 
>    2. The desktop is too big about 4 times than my screen of monitor. Why? I
> have to move my mouse all around in order to find some thing on the screen.


I'm using an i740 based card with the XBF server, so I'm not sure if
this will work in your case, but when running xf86config, it asks if you
would like a desktop larger than your screen.  Selecting no for each
resolution/color depth fixed the problem for me. Hope that helps.

Ben

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