I installed snow leapord on my msi notebook
after intalling complete and i be ready to the first boot
the apple icon appears and disapprear again and the screen turned white
but nothing after that eventhough the installation is succeded

my pc specifications
processor intel celeron m 1.86 mhz
ram 2g ddr2
wireless

please any help will be ok

What is your video card model/number? And you MSI model?
Can you boot with -x -v for possible error message?

my msi model is ms1613 or megabook msi vr600x
my vedio is mobile intel(r) 945 express chipest family

If you boot with -x -v and it did not give any error message then the problem maybe video card related, either wrong kext installed or typical problem with drivers.

You can install OSX without any video driver and see if it would help.
If not then research for your particular model to see if that is a common problem.

Try it and post your result.

Cheers