IMac 21.5 (2011) won't let me log in!

Hi again,
I'm having issues with my iMac lately!
It starts up, log-in-screen with all users appears, so far so good.
I choose a user, type in password and then BOOM!
WHITE/BLANK SCREEN hits me!
I still see the cursor and can move it around, but the desktop just doesnt appear! Nothing! This is with all users.
I'm afraid that I'll have too restore it to ML and lose all my data! I could just disassemble it, get the hard-drive, stick it in on of my ext. hard drive enclosures and save all the data onto my MacBook. But disassembling it is SUPER DiFFICULT and I'm too scared to do it!
Apple waranty expired already.
HELP!
I tried going into "Recovery HD" and repairing the Disk, but it says it's alright and theres no need to repair.
Tons of restarts didn't help either.

Jordan29 wrote:
I'm afraid that I'll have too restore it to ML and lose all my data!
Reinstalling OS X does not destroy user data. There is no risk in doing so but it may not be necessary. Try booting "Safe Mode":
Safe Mode or "Safe Boot" is a troubleshooting mode that bypasses all third party system extensions and loads only required system components.
Read about it: Starting up in Safe Mode 

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