MacBook (running 10.6.8) works only in the secure boot? What's wrong?

I woke up my MacBook to mode 'sleep' when I suddenly had a kernel panic.

After stopping and restarting my regular boot of the computer, the MacBook will run after the gray apple screen.

but after that, it hangs on a gray white screen and refuses to go to the login window.

However, on a secure boot, the MacBook starts as it normally should.

I managed to restore my MacBook 10.6.3 and after that, he started on a regular boot,

but after using the built-in software update upgrade to Mac 10.6.8 the same problem comes back.

My Macbook will start only at startup, once again.

I tried:
-MSC reset

-Reset the PRAM

-Try to use disk utility, but the button "Repair disk" grayed out.

Is there a solution to this problem?

When you tried to use the disk utility to repair the disk, you start from the DVD, or did you get this to run in OS X?

Tags: Mac OS & System Software

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