What do you mean by "ground pin" I've never seen an ATX connector melted or burned around the ground pins (ones that connect to black wires, in my book anyway) it has been almost always around the +5V lines/pins (red wires in most cases). In most cases it is due to poor contacts and or excessive draw per wire. Some of the old socket A AMD processors and mobos really ate the current on the +5. Most modern PSUs aren't made for that type of CPU/mobo combo, they need lots of available +5 current (Amps - something north of 30A was recommended), while most modern PSUs are setup to provide more power on the +12 rails. There were some Sock A mobos which did use the +12 to power the CPU (you'll find a P4-12V connector socket on them - I know MSI, Abit, Soyo and some DFI had the P4-12V; and some Asus had a fancy 3-phase +5V circuit, so most of those didn't have the burning/melting problem even on the relatively weak +12 rails of the day. I think this problem was quite common with Epox and ECS mobos (both had relatively unsophisticated regulators for the CPU power and were quite inefficient). If the heating problem didn't totally ruin the mobo ATX socket (check for loose pins), you could clean it up with some good contact cleaner. And get yourself a nice, old-school PSU with a sturdy +5 rail and make sure the female contacts fit snugly on the male pins - you may be back in action if you're lucky. Any actually damaged metal will have to be replaced (quite difficult to do with the mobo socket - probably have to replace the whole socket as the pins aren't available separately).
OTOH you may still find a sockA mobo with decent power provisions on fleaBay, etc. IAC, be sure the contacts at the ATX connector are clean and snug.
.bh.
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