Computer killed by insecticide; what compounds are likely?
Ingredients

So we could probably guess what's in the insecticide based on what's used in some of their other products.

Black Flag Flying Insect Killer

Tetramethrin - Sounds like the "active ingredient" here. By "active ingredient", I mean poison.  

D-phenothrin - Another poison. This product sounds like it kills more than one insect.

Petroleum Distilates - Likely a solvent. Unspecified

Liquefied Petroleum Gas - Propane or butane. An aerosol propellant. Was your product from a bucket or can? If a can, then it probably has this stuff.

So what happened?

My guess is that one of the products created a short circuit


  A short circuit is an abnormal connection between two nodes of an electric circuit intended to be at different voltages. This results in an excessive electric current limited only by the Thévenin equivalent resistance of the rest of the network and potentially causes circuit damage, overheating, fire or explosion. 


Typically, when something like a computer experiences a short circuit, it will stop functioning, "die", once the irreversible damage is done. As specified in the above text, circuit damage is likely done, and the circuits will need to be rewired. If there was no damage, then removing any remaining substances through a solvent, followed by thoroughly drying the computer, would remove the short circuit and allow it to function normally. It's possible that if the short circuit was created by a solvent, that the solvent has already been removed by evaporation, due to common organic solvents' melting points.