How can I get past the white screen?

When I start my iMac I see a message that my start up disk is full and that I need to delete files. After I type in my user name and password, all I see if a white screen. This problem started today. The error message about the start up disk started two days ago, and when I looked at the disk, I saw that over half of it has files described as "other". The hard drive is 250 GB. I have Time Machine backups but I don't know how to get to them to help me. So, I guess that I have two questions: how do I get past the white screen, and what are the files that are catogoraized as other? Thanks.

I did not put the OS info in my question because I am not sure what I have. I upgraded to Lion so that I could use the cloud between my devices, however I do not know the number.
Apple menu item->About this Mac and the version is listed there. Click on that and get the build number. Click again and get the machine's serial number.
I am stuck on the white screen. Any other advice?
Start with a google search for white screen mac. This one might do the trick: http://www.mac-forums.com/forums/apple-desktops/138137-imac-wont-get-passed-whit e-screen.html

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