IMac saying "start up disc is nearly full please delete some files"

My iMac is one week old today. I've got hardly anything installed on it and Macintosh HD say's I have 252.87GB available space.
Yesterday I started getting an pop up saying "start up disc is nearly full please delete some files". I can't understand why as I have so much free space available.
I've googled around and not found anything that could help. Just a few people saying use Disk Utility etc. I've done all that now and it still comes up.
Any help welcome
Thanks

Hello d:
Welcome to Apple discussions.
Run repair disk from your software install DVD.
If you still get the message, call Applecare - you are well within the warranty period.
Barry

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    https://discussions.apple.com/message/16276201#16276201
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