please answer the following questions:

A GC column using a TC detector is used for only three chemicals (this application). It was working fine until today. For some reason, the output shows excessive NOISE/Spikes. For this problem, we'll assume that we have isolated the TC detector as a problem. Now, discuss what would you look for possible causes for this type of problem. (Although, sometimes it is tempting to quickly change TC detector. However, this will not solve this problem. Even with the new TC, the problem will persist). A GC column using a FID detector is used for only three chemicals (this application). It was working fine until today. Today, however it shows zero peaks. Let's assume that you have checked and made sure the sample and carrier gas flow, pressure and purity (carrier gas as you know moisture should preferably be at or below 1 (ONE) ppm) of the carrier gas are fine. Think what are some of the items that could cause this result> (We will assume that power to the GC system and the oven temperature are fine)