I installed Ubuntu 12.04 on my Lenovo x220 then upgraded to Ubuntu 12.10 now I get a blank screen after I see the ubuntu logo and the four dots below it. I see my wireless indicator lit as well as my bluetooth indicator lit. Nothing else. Please help!
I don't know how to fix your issue, if it were me, I'd do a clean install. I suggest never "upgrading" to newer releases. Always just save your data to storage device and do a clean install of the new release, you'll have better luck that way. This is just an observation based on personal experience. And personally, I only go from LTS version to LTS version, I no longer do the in-between versions. I'm running 12.04 on this machine until the next LTS version comes out.