first a can of compressed air to super cool the plastic to see if that cracks it away from the other surface,
then a hairdryer (maybe too cool) then a heatgun (maybe too hot) to warm the plastic to make it flexible.
Every cable should have an AWG rating stamped on it. Don't load it with more Amps than it's rated for and it won't melt.
Hillbilly method, if your cable feels warm to touch within the first minute of power up, you're probably overloading it.
Thanks, good suggestions, Ya I have a good idea why it overloaded, was under spec( I think) but not by much. Any recommendations on a particular heat gun?
Do you know if the ATX24 just supplies PCIe's only? with the cpu drawing from those additional connections on the mobo? If CPU is on this too.. well that would be the problem.