Mac will not login and will not get past start up blue screen

I installed a new security update and then I clicked for the computer to restart after it did it would not login into the computer, it just stays on the blue screen and says starting Mac OS X... Also before I had to login with my username and password and it just automatically skipped that step and tried to login. I have tried using the disk utility in the install disk, I have also tried the fsck and nothing seems to be working. Please help with any ideas or thoughts you might have.
thanks
sean

Hi table,
I had the bluescreen thing happen to me a while back. I too tried to login as 'safe-mode'. The first time I tried it I must have gotten the timing wrong because the login window did not appear. I did eventually get the timing right and it worked, however prior to that while I was sitting there looking at a blank, blue screen I hit the enter key. The login window just 'popped' in at that point. It may not work for you but it couldn't hurt to try it.
Jrsy

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