...computer heat throgh starting?

Check your heat sinks they may be clogged up with dust, try cleaning them if problem continues add CPU fan(thinking CPU fan is not present) or replace the fans.

Think Ive got this, Use a static Cuff, Remove heat sink and clean the fan (tooth brush is good for Heat Sink Fins and cotton buds for the fan, remove Thermal paste (carefully) white spirit or lighter fuel liquid, apply new Thermal paste to the top of the CPU (a drop say 10-12mm across as it will spread when Heat Sink is replaced, and a drop half that size on the bottom of the Heat Sink rebuild the assembly (fan, heat sink) and all will be Cool.