Ah sorry, I read that wrong.
You might want to use the PC so that the
CPU warms up to a hot temperature before you shutdown and try to remove it with some gloves. I would still find a small flathead screwdriver handy if you can reach, you can either levar the edge of the
CPU or hold the
cpu down (depending on the
CPU), and use and lift the heatsink up from the same corner. As long as your gentle enough!
Apart from that, I can't think of a "safe" method I could post here to remove it. Maybe some of the other techies may be able to offer a better solution.