Help! Macbook can't start up and a folder with a symbol "?" in it.

my english is not good
i hope u can understand what i said about the situation
about 4 days ago,i opened a psd file in may mac,but my mac worked very hard at that moment.and the cursor turned like a coloful circle
then i shut down the power
after couple of hours i opened the computer again,but terrible thing happened
it could't start up,just a blank screen, a folder with a symbol "?" in it.
someone told me maybe there was something wrong with the hard drive
so i put the system disk 1 into the computer and use the Disk Utility but it can not find my hard drive!!
Disk Utility show that only a cd,no hard drive
what happened with my mac? can anybody help me?
Message was edited by: noirz

thx ^_^
i bought my mac in september last year so i still can get some care with my mac from apple inc.
$1600 is too expensive and it's not my mistake about the situation.
i found many people have this problem: computer doesn't work -> shut down the power -> can't restart ->hard drive crashed
so, don't u think the hard drive is too weakness? i've never got any problem like this when i use other computers
sigh... the most important thing is send my computer to the service
T_T ...pictures...movies...music...memory...etc..

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Help! Macbook can't start up and a folder with a symbol "?" in it.

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