I changed my imac hd setting to no access and then i restarted it. Now, im stuck on a white screen, what do i do? I can't even enter my password.

I was playing around with my imac (because im an idiot), and i clicked on computer. I decided to change my macintosh hd setting the last one (can't remeber if it was everyone or something else) to no access (it was on read only). After i did that i couldn't click anything, i tried to change it back but it wouldn't open the computer page for my so i couldn't click on the macintoch hd. I pressed the start button on the back until it shut off. I waited for 10 seconds and then i started it up again. It opened on the grey page with the apple logo and then it went to the white screen i waited for the page to change so i could enter in my password but it never came up. It's just stuck on the white page. I'm freaking out right now, i don't think i have my files backed up, but right now i could careless as long as my mac works. It's the iMac 21 inch screen and OS X Lion but i've done software update. Any ideas?

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