ioapic: version 0x20 vectors 0:23 solution

I've noticed that many of you have problem with booting OS X on theirs PCs. The problem is known as "ioapic: version 0x20 vectors 0:23". OS X starts booting and then it just freezes. I've searched thru many forums all I found is an adivce to change HDD mode to ATA. Didn't work... (Dell Vostro 1500 with C2D processor). Here's what helped me:

1. Insert your osx disc (tested iDeneb v1.3 10.5.5)
2. Press F8 or just wait when you are asked to press any button.
3. Now type in the prompt:

cpus=2 -v -x

4. This will force the bootloader to use both cores of your processor (I assume that you have dual core processor), start booting in verbose mode (-v) and safe mode (-x)

Your OS X installation should start now. Hope this will help, helped for me.