if the problems is video kexts (aka drivers) u could try bootting "-s" into single user and then remove any problematic kexts (the ones that fix your graphics card), so try boot then with the default video and fix the graphics ketxs.....

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CPU: Intel Pentium Dual E2140 1.6 GHz. Graphics: Intel(R) 82945G (128 MB). Board: Asus P5GC-TVM/S Chipset: Intel Lakeport-G i945GC. HDD: 232 Gb S-ATA Samsung
Version 10.6.2 32bit. Kernel: Vanilla. Audio: VoodooHDA 0.2.2 with prefpane. Video: Stock GMA. PS2 fix: VoodooPS2
USB 2 not working

Acer Aspire 4530-6823
CPU: AMD Athlon™ X2 QL-62 2.0GHz. Graphics: Integrated GeForce® 9100M G. Chipset: nForce® MCP77MH.

NVDAResman.kext was always my main update problem...

thanks for the replys eMatos and erick2red.

First of all this is the line that i get stucked
"using 10485 buffer headers and 4096 cluster IO buffer headers"

Yesterday i tried to do the same update on a new system. I installed ideneb 10.5.5 with different driver settings ;

ICHx Fixed
JMicronATA (this is something new for me)
9.2.0 SpeedStep (this is too, i usually used vanila)
ACPI-Fix
Cpus=1-Fix
and nvinject for the video.

and my system works like a charm. But after i did the update (as i learned from this topic) i saw the same line again.

i also tried to boot with -s, -v , -x, -F. nothing happens.

Today i will try to install directly ideneb 1.4 (i get stucked in the same line as i tried before). I wont chose voodoo kernel and i will add ACPI - FIX manually (as i read from this topic).

i will tell you the results.