[Lilux-help] problem install mandriva2006

Hi I've tryed recently to install Mandriva 2006 on a laptop Acer Serie "Ferrari4000" (with a AMD Thurion 64b, 100GB DD, etc...) but this fails to start correctly in graphical mode: the screen is 15"4 size, resolution is 1680x1050 and card is ATI radeon mobility x700; this hardware is apparently very new and corresponding driver not included in most recent linux packages (even Suse 10 which however correcly recognize the hardware) but ATI furnish a 'generic driver' for linux 64b distros; problem is that the installer works only in graphical mode; I've also tryed XFdrake in failsafe mode and change parameters, monitor (I'v tryed vesa, ati, radeon..), type of panel (changing frequence, resolution...), resolution...without success... Any suggestion? Thank you in advance Cheers M.