Be patient, these animals can be frustratingly finicky. But, they are awesome pets for those who are willing to be patient and work with them.
I've had my new Borneo for over 3 weeks now and he's showed no interest in eating. Each time I adjust my technique a bit and hope for the best. Once he eats, I'll just keep doing whatever I did to achieve success and stick to it.
Unfortunately, sometimes we just have to wait them out.