When I start my iMac it gets stuck and the letter. M just keeps typing away

When I start my iMac the keyboard isn't working and it just keeps ping an m
X

Good that you can get to it through TB.  Use that connection to delete some files you no longer need so you will have room to boot the system and/or resintall the system.
You can also try booting in Safe Mode.  That sometimes willl clear up enough disk space so it willl boot and then you can delete some files from there.
http://support.apple.com/kb/HT1564?viewlocale=en_US
If that won't work there are other remedies that take more work.  Post back.

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    Welcome to Apple Communities
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    You won't lose your files unless something goes very wrong -- which may already have happened. You absolutely must have a backup before you do anything else. If you don't already have one, boot from your installation disc and follow the instructions in this article under "Instructions for backing up to an external hard disk via Disk Utility":
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    Hi,
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    Try reset iPad
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