I have been given an old iMac (I think it is from around 2011) that had a faulty HDD. Replaced the HDD and trying to install Manjaro. After booting from the USB the screen splits into four separate windows. The resolution is so bad I cannot read anything. I did manage to get Deepin running without any issues so it is not faulty hardware. When Deepin boots it displays a message drm:radeon_init No UMS support in radeon model.