Imac running VERY hot

hi all-

I have an old Imac Rev. D (just for play) and after it has been on 4 about an hour or so it is very hot, i didnt know if this was normal or not then when it shuts off , as its coolong down, its sounds like bacon frying from the sizzling it makes

Spec:
96MB RAM
6GB HD
CD drive
OS 8.6

No that is way too hot. Do you smell plastic/insulation burning? It's probably the PSU, if it was the CPU it would be dead.

YES! it does smell like the plastics are burning, I have not been using since it has been getting so hot

any suggestions anyone???