thanks for replay , and i tried hibernate command but when i want to
reopen my laptop again it does not open so i turn off by press on power button
for along time then restart it again , and in that case i will lose all my
current work .
i do not know !! maybe the problem is as you mentioned before , the booting may
takes 10 minutes , and of course no body will not wait for 10 minutes !!!!! .

i will try to get 10.4 as soon as possible .