I tried installing proprietary fglrx drivers by following instructions from https://help.ubuntu.com/community/BinaryDriverHowto/AMD However the installation failed with the error 'amdconfig: No supported adapters detected'.
Now laptop boots to a purple screen followed by the black screen. I had made a backup of the xorg.conf file but replacing it does not solve the problem.
I am lost. Please help me get the login screen back.
As suggested I tried adding nomodeset after "quiet splash" in the Grub-menu. However the system still boots to a black screen. Here are the current grub settings:
GRUB_DISTRIBUTOR='lsb_release -i -s 2> /dev/null || echo Debian'
GRUB_CMDLINE_LINUX_DEFAULT="radeon.modeset=0 vesafb.nonsense=1 quiet splash nomodeset"
Kindly suggest what else can be done to rectify the problem.