Help with Sand Boa. Has't eaten in 3 months.

[Omniarc]

So a friend bought a Sand Boa from a breeder roughly 3 months ago and hasn't been able to get him to eat since getting then, and roughly 3 weeks ago she gave him and his set-up to me so I could try.

His set-up is kind of basic, and Ive since then replaced things in hopes of solving the problem but still nothing. I'll list below what he had and what he now has

-Had black sand, Replaced it with ZooMed Aspen Snake bedding
-Had a 50w light producing bulb, Replaced it with a 75w Ceramic bulb

I've tried feeding him f/t pinkies and I've done everything I can think of with them. I've wiggle'd it, brained it, bled it, fed him outside his container, fed him inside his container, dipped the pinkies in both chicken broth and tuna, offered smaller parts of the pinkie.

I'm at a loss for what I should do. This is my first snake and I'm not sure what else can be done, though I'm sure there is plenty more.