After successfully installing and running 10.6.3 on my Dell 1520 inspirion laptop, I tried to upgrade to 10.6.7, however, after successful install of 10.6.7 combo pkg., and selecting RESTART button on the successful 10.6.7 install window, it hangs indefinitely at the Apple logo and spinning image.

When I boot it in verbose -v the last line is: SATA WARNING: Enable auto-activate failed.

So, I did a disk repair in disk utilities, hoping that would help. But the boot still hangs at:
SATA WARNING: Enable auto-activate failed.

Any help will be greatly appreciated.