Video Display Problems

I have installed Linuxppc on a PowerMac 7500 (604/150 Mz processor, 48 Meg RAM, Apple 1705 Display) and are currently experiencing a poor quality video image.  Gnome icons, folders, and graphics are severely distorted and essentially illegible.  The terminal window display quality is fine. It would be greatly appreciated if you could suggest a possible solution to this problem.  Thanks.
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mdhyattAuthor Commented:
Edited text of question.
the prob is definitely with the video card.i have a SiS card and when
                      i first installed linux i had the same prob.
                      But ever since i moved from redhat6.0 to 6.1 this prob is history
                      so u can upgrade to either rh 6.1 or read on
                      this method can be used with every distribution:

                      1.Run your X86Freesetup or xconf or whatever u use to configure
                      the system keyboard vdo card etc ( not linuxconf or

             choose the right kind of monitor or better still (as i did)
                      specify the scan lines (ex> horizontal scan 30.5 - 54
                      vertical scan 50 - 90).This is verrry important.refer to your moinitor
                      user manual for this else u can just choose a standard monitor.

                      3.Now if prompted whether u want to look at the video card
                      database asnwer yes and choose it correctly.
                      choose the right amount of VRAM.if your vdo vard does not have
                      any clockchip (most dont and yours may not have too) or RAMDAC
                      (same here) do not choose any.

                      4.Choose the the resolutions u want
                      rest is straightforward

                      5.verrrrrrrrrrry imp------------>note down the name and path of the
                      file into which these settings are written into and then use your
                      favorite editor and open it for editing

             for the line that descibes your video card :

                      you will see a line like this
                      #videoram 4096  
                      where 4096 or 1024 is your video ram and # represents a comment
                      so remove the #
                      this becomes
                      videoram 1024
                      ofcourse leave the caps and lettering as it is as linux is exxxtremely
                      case sensitive.

                      now add the following lines exactly

                      Option "nolinear"
                      Option "hwcursor"
                      Option "no_accel"

                      plz note the lettering and quotes.

             save the file and type startx or whatever and enjoy!!
                      if u want higher resolutions then remove the line

                      Option "nolinear"

                      and add

                      Option "nobit_blt"

                      then u can start higher resolutions by typing
                      startx -- -bpp 16

                      so  enjoy linux coz its happening!!!

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