Computer has just started doing this on switch on everything is ok,machine posts ok and boots then after a few minutes a hissing noise appears from around the cpu area,the pc then shuts down and will not restart untill i unplug then replug power.This just happens over and over.Cpu is Athlon 2000+,M/B Abit KR7A.Any comments welcome.
Could be a plug and socket arcing ? Try pulling out all the plugs and reinserting them, and look carefully at the plugs/sockets for signs of arcing. Black, discolouration of the pins or circuit board below the pins. Good luck.