Updated software - now iMac wont start up

Hi
Im new to this, I have just been given a iMac to play about with and updated the software on it like it told me too, then it said to restart the computer but now all i get is a white screen with the apple logo and a flashing circle display, i also dont have any of the discs that came with the iMac
Help please
John

Welcome to Discussions - ask the person who gave you the iMac for the discs, there is little you can do to repair it without them. You can try to reset the SMU:
1. Turn off the computer by choosing Shut Down from the Apple menu, or by holding the power button until the computer turns off.
2. Unplug all cables from the computer, including the power cord.
3. Wait 10 seconds.
4. Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
5. Let go of the power button.
6. Press the power button once more to start up your iMac.
And you can also reset the PRAM.
Let us know if either of those helped,

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Updated software - now iMac wont start up

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