Mac will not START UP after software update. Help?

I just updated my 24" iMac to Snow Leopard and also put on the new iLife package. Everything was working fine, Then i tried to get onto the internet using my Bigpond wifi (usb stick) the software started fine and connected to the internet, but in safari no web page would load. so i clicked on the update software/firmware option for the bigpond wifi usb stick and after several minutes realised everything had frozen. nothing would respond.i held the power button down, it shut down. Now it will not power up. just sitting at the first white screen with the apple and rotating line dial. I have tried all of the stup options recommended iner manual and removed/replaced te ram. still no fix.. Can someone please help?

Try starting the Mac with the original DVD that came with the computer, then run disk utility and repair the hard drive also repair permissions. http://support.apple.com/kb/HT1782

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3. Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When you reach the screen to select a destination drive click once on the destination drive then click on the Option button. Select the Archive and Install option. You have an option to preserve users and network preferences. Only select this option if you are sure you have no corrupted files in your user accounts. Otherwise leave this option unchecked. Click on the OK button and continue with the OS X Installation.
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I got my White macbook last week.
This afternoon, I ran a software update which had 6 items including iTunes 8 and OS X updates to 10.5.5.
I left the software update running and upon my return, the Macbook had powered off and I could not power it up again.
Tried everything in the manual and finally called my reseller for an appointment.
I am very surprised that this happened.
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waynefromhockenheim wrote:
Hi, Last night i downloaded flip for mac & a Samsung software (propably Windows) for my mobile phone... before shutting down i was asked if i want to install & restart, i said yes, after installation, now my mac will not start.... how can i go about this problem?
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Mac will not START UP after software update. Help?

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