Can some one please help me? Recently I have had to use my old pc again but the problem is that the 4 pin ATX12V cable overheats to the point of melting. I have replaced the psu but the wire still heats up, I have tried underclocking undervolting and an extra fan and it still overheats. As I mentioned it's my old pc Motherboard g31tm-p21, procssor intel pentium d 915, psu 450w graphics card gt240. Any help will be appreciated.