i am trying to install Fedora-Workstation-41-1.4.aarch64 on to a RPI 4 , 8 GB Ram. with a RPI touch screen 7 inch.
i get a blank screen on with some white stripes during boot
I tried to get this going a couple of years ago and failed.
You should look at the fedora rpi docs and see what the current status is.
Edit: you almost certainly will need to do some rpi specific config to get this working.
I installed f41 on my RPi4 and it worked with a 10.1 inch touchscreen. However I was unable to login without having a usb keyboard/mouse since the touchscreen is not functional with plymouth. It is functional once logged in.
My touchscreen monitor is HDMI connected and does not use the rpi ribbon cable. It has an additional usb cable to control the touch (like a mouse).
It connects to the Pi with an HDMI cable & USB cable, The only GPIO connection is that it draws 5V power from the Pi gpio pins (but can be separately powered by USB). Video is via HDMI and touch control is via USB.
The Pi mounts directly on the back of the monitor, very near the center.