when i open the client thing i see white

i dont see loggin screen! i see it white!
what to do?

My friend had this problem
Just download the latest version of java from java.ccom

where i download the client?

It happens to me , im trying to download java but dosnt seem to work , btw i have a mac does it still work?

i hav the java and everything and it only turns white if i minimize it...but my problem is that it will only load to the part were it says requesting models...then it stops...what do i do?