If the CPU overheated due to CPU fan death or poor heatsink contact - replace it. AMD's die instantly in overheat situations. From Experience.
My PC (ATX Athlon TB 1300) crashed (for overheat ?)
Then impossible to restart it.
Motherboard diode is green (therefore power works)
When pushing the button, nothing happen, NOTHING, no fan, no vid, no move in the floppies, and the green diode on the MB still on...
Then I removed all, HD, boards, RAM, CPU), still nothing....
What can I do ?