Computer won't turn on. PLEASE HELP!

Hi, my iMac's internet connection was a little dodgy yesterday, so after trying for an hour to turn it on, it didn't work. I switched the computer off, leaving it for a couple hours, in the hope it would work better when I got back.
I went back to the computer and tried to switch it on, only to hear the 'turn on' noise, go to the white page with the apple logo, when the screen would turn grey and a sign saying something like, 'Please restart your computer. Hold down the power button for several seconds' popped up.
I turned it off, and kept trying to turn it on, with this message still appearing.
We called up a business and we were told to insert the Mac OS X Leopard disk, and hold down the 'C' button. After that, the CD loaded and we went into 'Utilities' > 'Disk Utilities' > Verify > Repair Disk. When the check was complete, it showed that nothing was wrong with that part of the computer. (I'm guessing that it means rhere were no configuration parts missing or something..?)
Has anyone experienced anything similar to this or has anyone got any advice?
My computer is only 10 months old and I'm desperate to get it back as quickly as possible without losing my data.
I'm very appreciative to any help.
Thanks for reading
~ Shelly

I was reading on my PC about kernel panics, and decided to try starting the iMac in safe mode (by holding down the shift key on turn on). It worked, and I am typing this message from the iMac..
I have been reading alot on kernel panic's, and I was just double checking that if I completely reinstall leopard, will all my pictures, documents etc, be deleted?
If so, are there any other options??
Thanks for anyone's help.

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Computer won't turn on. PLEASE HELP!

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