iMac booting windows as primary?

Hi Guys,

I installed windows via bootcamp last night trying something, I got rid off the partition via the bootcamp as I no longer needed it.

For some reason my iMac attempts to boot windows, as I see the "-" at the top left of the screen but the partition isn't there anymore?! :S

I can click the "option" key and it then does boot Mac OS X, but it's just I shouldn't have to do that should I?!

This also is the same problem on my MacBook Pro?

Thanks in advanced!

Go to System preferences and click on Startup Disk. Select your OS X drive.