i mac problems

Because our group was a bit behind in editing, i stayed behind after college on 9/12/09 to do some capturing which we filmed on that day as well as editing however it didn't go according to plan; the i mac kept on freezing so i didn't get much editing done. on the 10/12/09 we had a lesson in the afternoon. while editing i made a decision to edit from the begging of the song because if u put something new in the time line it moves everything you have edited already. i did allot of editing in such a short period of time. i was nearly at the end of the song, everything was going great ,i edited the lip syncing and it was on time, i had put all the editing transactions in the music video but the unexpectedly happened the i mac shut down so faSt that i didn't have time to save anything. when the i mac loaded up everything that i did in that lesson had gone deleted. i was so gutted tears where coming from my eyes. because the i Mac lost all the work we did in that lesson we had to start again which meant we were now even more behind than everyone else. after taking time to calm down, Tom started editing from the beginning, after a while i toke over from Tom and started editing but found it hard to try and mach the lip syncing and i couldn't remember how i did it before, so because it was frustrating that i wasn't matching the lip syncing i decided to start again because i though maybe if i edit it to how it was before i might be able to figure out what percentage would be best suit the lip syncing, at this stage i had stayed after college for more than 3 hours trying to edit the footage that was lost.while editing i got frustrated not being able to match the lip syncing with the song because Mo sang to fast and Marcell sang to fast at some times and other times he sang to slow which was a challenge i had to overcome.