I've already installed windows. Its impossible to install Red Hat Linux in graphical mode the screen just goes blank shortly after booting with the linux cd
I succesfully installed in text mode. After booting the system I select Linux but the screen goes blank after some time. I put the same hard disk in a diffrent computer & Linux is OK
It sounds like your video card is the issue. When it asks for a video card, try a generic one and see what happens. Also look on the manufactures site for any RH patches.
boot with a live-cd, mount your rh / partition end edit the default runlevel in ../etc/inittab to runlevel 3
then download your graphics driver from your vendor, or search google, perhaps there is already a stable driver that you can download with up2date such as kmod-xxx
then boot your redhat again and install the driver, or if you know how, chroot to your rh / partition and load your redhat environment
don't know how to do this in redhat, in gentoo its chroot /dev/bla &&env-update
(perhaps someone can complete this issue)