IMac intel snow leopard white screen must restart?

since i installed snow leopart my iMac frozse with a white screen. I pressed and held the power button and the computer restared ans seems OK. I ran the Hardware test from the install disc and no problems were fond. What is wrong?

It soumds like nothing is wrong now, but there isn't much we can say without more info from you, like what you were doing when the iMac froze, if this happened just once, etc.

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    I forgot to write down my computer specs:
    iMac 27 Mid 2011
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