After errors with disk partition, I removed Windows from my iMac. Now when I start my computer it goes into a black screen and not straight into the Mac area like it used to, unless I hold Alt straight away to give me the option.  Any help?

Hi,
Sorry, I'm new to the community, so apologies if I'm repeating myself.
OK, so I tried to install Windows Vista onto my iMac with the disk partition.  Everything was going fine and it wasn't until last minute, when it was installed that an error came up saying that this can only be done with Windows 7.  After this error, I couldn't access any errors of my iMac and when I shut down and restarted my computer, it automatically logged into Windows.
So after a panic, I rang Apple Care and the lady helped me log into my apple area, delete Windows from my iMac, and all was restored.
However, now when I shut down my computer and boot it back up, I think my iMac is trying to log into Windows areas that no longer exist.  It loads up a black screen and doesn't move from there.  To log into my Apple area, I have to do the whole process of holding Alt immediately after I switch the power on and access the Mac drive and log in that way.
It's beginning to become a real pain and I'm paranoid this process is going to damage my computer.  Any advice on how to restore logging-in back to it's former glory when I first purchased it?
Thanks

Solved it.  Thank you very much for that!

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