...you mean thawed. How would you feel if you swallowed a block of ice the size of a basketball? Only ever serve feeders when COMPLETELY thawed ALL THE WAY THROUGH. It is extremely dangerous to do otherwise.
Don't panic about 2 weeks fasting. That's nothing. Here are a few things to try. But, only try to feed ONCE PER WEEK - it's no big deal if he goes another month or so without food.
First off, ensure cage conditions are PERFECT. Small enclosure, no bigger than 2/3 the length of the snake. A perch to climb on (and hunt from). 2 hide boxes - light bulb boxes work well. Temps will rise and fall in a small enclosure, with no real gradient - but you can achieve a desire gradient throughout the course of the day. Daily low of 75, daily high of 90. Remember, JCPs are found in North-East Queensland, where daily max in summertime is anywhere up to 105. That said and done, leave a couple of days and then try one of the following per week -
1. serve warm. you can warm by placing in hot water. (or, alternatively, in a plastic bag and then in hot water)
2. cut the scalp open, exposing the brain (of the feeder, not the snake). The brain fluid is very potent.
3. Put it in warm into the enclosure and leave for a while. Do not disturb the snake. Keep him in a dark place for an hour or so. Could also try leaving overnight.
4. Following (3), after an hour or so of having the prey item in with the snake, try and provoke the snake by tapping him with the feeder. You may want to rewarm.
5. Dangle with tongs. The snake will form an 'S bend' if you slowly lower the feeder into the enclosure. The tongue will flick rapidly. He will become alert. Put the feeder beside his head (not in front), as this is where the heat censors are. Touch the last bend in his neck before his head.
6. Ensure the feeder isn't too big. If he is striking, but not coiling, it could be because he feels it is too large a meal to handle.
7. Try feeding dusk or dawn.
Good luck.
Cheers.
Aaron.