Thanks for the fast reply! I am kind of worried that I have trashed the MKIV so your response is greatly appreciated. I have been using Maxwell CD-Rs. I will keep trying to re-install and I will try to use different versions of the updates.

Will I do any further damage by inserting OS discs and having to turn off the power to remove them if it fails to load?

Is the power light being out on the computer keeping the OS disc from loading?