Hasta La Motion!

I have Maya 2011 on a mac and I was wondering if I could reset the Batch Renderer in Maya. I am very new to Maya, I was a Cinema 4d user, so it is a lot different. You see I setup a batch render and let it go half way. I stopped the batch render by just closing the script editor, not by using the stop batch render command. Now in the same project I tried to start the batch render again after I made a few changes, but this time it would start rendering where I stopped and only for a few frames not till the completion of the timeline. I read some forums which said to start a new file import the old file and optimize the render settings and then try it again. Problem is that It starts rendering the new sequence, but along with the frames where I left off with in the previous file. That is I stopped the render in the first file around frame 450, so as frame 1 of the new file is rendering, 451 from the old is rendering too. Also as a result my new sequences images look kinda weird, not at full res and like the sky that I setup is missing. I can send both .mb files if you would like to look at them. Please help!