Undo buttyon just stopped working [greyed out] just as I delete a vital part.

Title says it all really, I've always done this before with no issues, just before I export my work I'll cut out 95% the video/audio, leaving 5% to export at different qualities to compare. Then I just Apple_V (paste) or often I'll just type Apple-z to undo. Thing is I'm having some major issues with Imovie 10 in terms of export options and file sizes so copied my old Imovieto my app folder during this so I can use that in the future. I can't see how that would have effected anything though.
This was a 8 hour project =/
Surely with the amount of metadata, hidden directories and general unique functions I'movie has enables you SOME way to simply reverting the last thing you did, or restoring the project from a previous date?

No, I tried other DVD's, both movie and data - none will mount.
I am almost positive that it is not a hardware problem. The computer was used in a networked office environment for three years. The Superdrive got little use, mostly just to install software and an occasional disk burn to give someone a document.
This AM, I reset the PMU as well as the PRAM and NVRAM to no avail. When I tried to mount a DVD, nothing happened and the disk was spit out again.
The following error was logged:
eric-snyders-imac diskarbitrationd [59]: ClassicPrefHWTest [227]:24587 not responding
Whenever I see "not responding", it suggests some software is hanging up. I guess since it only seems to be a problem with older iMacs, Apple is unlikely to do anything. Very annoying - I'm starting to feel like a PC owner.

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