If your cuttings are going to die, they usually just kinda collapse - sorta the same effect you would get if you left a fresh piece of lettuce out on the counter. Right now, the leaves are turning yellow because the cutting has no roots, thus no way to take in nutrients, so it is feeding off itself, thereby causing the leaves to yellow. What you are hoping for here is that roots will begin to grow before the plant completely cannibalizes itself.

I've never tried using peat pellets before, so I don't know what to tell you to expect. From everything I have read, peat pellets suck big time. However, your cuttings look normal for this stage of the process, so hopefully they will root successfully. Roots take 5 - 14 days to appear, just depends. Misting the inside of the dome and opening the dome a couple of times each day are about all you can do at this point. Go ahead and cut off those leaves that are obviously completely dead. It will help to keep rot out of your environment.

Patience, Grasshopper.

PC :smokin: