Low Graphics mode? I cannot get into my computer. Help!

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http://askubuntu.com – I recently updated to 13.10. since then i have not been able to access my computer at all. it tells me the system is running in low graphics mode. my screen, graphics card, and device settings could not be detected correctly. i will have to configure them myself. from there, nothing works. it gives me a bunch of options but none of them do shiz. by the way i have a Powercolor Radeon hd7850 graphics card. help me make it work I tried this stupid solution that someone else posted, but i cannot make any sense of it. can somebody please just lay out what i need to do in a simple, straightforward (HowTos)