I have a 8GB thumb drive with Mac OS 10.6 installed, which I've previously used successfully to hack a 620 (woot). 
  
Now, I'm trying to do the same for a 630 with nVidia, 3GB ram, BIOS A17 using this same thumb drive. 
  
I've download the most recent bootpack for the 630 w/nVidia and added the Extras to the thumb drive using myHack 3.2. I've set up the BIOS per instructions here, and disabled Wi-Fi in BIOS (because it's Intel). 
  
The bootloader works perfectly. When I invoke -v option, it loads: 
  
Loading Darwin 10.6 
Loading kernel /mach_kernel 
Read HFS+ file: [hd(0,2)/mach_kernel] 4096 bytes. 
Read HFS+ file: [hd(0,2)/mach_kernel] 7440004 bytes. 
  
and then it just halts with no further message. 
  
Any hints as to what might be the issue?  
  
Is is possibly related to re-using my thumbdrive from the 620 install (even though I reinstalled the correct boot pack)? 
  
Is it possibly related to me using an HD from a real Apple MacBook? 
  
Thanks in advance for any help you might give me!