Savs generally tend to be a bit more shy...are you near the cage waiting/watching for him/her to eat? S/he should come out on its own to find food...digging it out with just cause unnecessary stress. If the sav is ignoring food altogether then it may be time to take a fecal sample and your monitor to the vet...it is unusual for monitors to ignore food unless already fed to satiation during the day, or something is off with the husbandry. Double check your temps.

Hope that helps! BTW, feel free to post pictures!

-Jason