ok, i have contacted the person who did the NBI usb booter. Let's see if he is willing or have time to help out.
I will also try with copying boot file to / folder.
edit:
Okay, I tried copying the boot from this NBI usb into my / folder. The first time I booted, it shows highres gui screen fine.
On the next reboot, gui fail to show. Only text are shown. It doesn't even boot up anymore. Stuck as text screen with below text:
{long white bar }86:27cc] at 00:1d.7
Legacy USB Off Done
This is what happened also when I used the Netbookinstaller 0.8.3 to install chameleon bootloader contained in it.
http://code.google.com/p/netbook-installer/Then, i fix it back by booting up with NBI usb (which works) and then replace back my boot file from RC4.
The puzzling thing is, why does it work the first time after I replaced boot from NBI? Does booting up modify some files that causes it not to work after that?
Please take a look guys, thanks.