Could be a Power Supply issue ..but yeah we'll have to go through it 1 piece at a time.
Need your System Specs ..
PSU = Make Model and Watts
CPU = AMD Ph II 965 BE
HS and Fan = Stock (well not anymore)
MotherBoard =
RAM =
Graphics Card(s) =
Hard Drive(s) =
DVD Drive(s) = ( I assume just 1 standard $20 burner)
any other components , like PCI cards (sound cards, NICs , USB expansions, TV tuners, etc)
you said it wont turn on anymore ..your CPU ..might be ok (and that's a mighty big IF)
since it generally has a feature to turn itself off if it hit certain Temp.
though you prolly fried your PSU ..hence no power to turn on with ..
how exactly did it start smoking ..was the fan wire hitting the fan blades ..and making the noise of hitting ..or did it just start smoking