My old computer refuses to start in cold days. So, in really hot days (about 40ºC / 104ºF ) or even hotter, this PC usually starts, but in cold days, it wont.

When the temperature is not in the "sweet-spot" the power light turns on for an half a second and then the computer turns off. But when it's really cold, not even the power light turns on, nor even a blink. Sometimes I use an Hair dryer, pointed directly to the PSU and that works great. 5 to 10 minutes is enough, depending on the ambient temperature. I think something is going wrong in my AT power supply.

I can't replace this PSU for another because it has a non-standard size and connectors to power the motherboard.

Does anybody have a clue about what it's failing in my PSU, so I can change that component (resistor, capacitor, ??, etc) and rock on with my 80386?

Thanks