Why won't my car start/turnover!?!?! is it a vampire? (seriously) plz help?

I just got my 2001 kia optima out of the shop because the fuse box melted some along with some connectors and wires...they removed the push button start (after market) and said that was probably the cause (faulty wiring job).. i went to pick up my car and it didn't start...the battery is relatively brand new (less than a year old with a 5 year warranty...its like 3-4 months old..so they said we'll check it out...then they said the car started the next day no problem multiple times..and that it was probably a bad ignition switch or neutral switch (neutral something...not sure exactly what they said)..but i drove the car that day and it started just fine in the morning...then i stopped and tried again in like 2 hours and it didnt start...basically it seems the car only starts at night or in the morning....im assuming that means it only seems to like cooler temperatures...EVEN THOUGH once it is started once and the car is warmed up it can be turned on and shut off multiple times no problem (basically everything is normal at night?). is my car a vampire or what!? oh btw my doesnt turnover or make any noise (during the day) when I turn the key from the "on" to "start" position, and the radio turns off when i do go from the "on" to "start" (i read somewhere that that means my ignition switch is fine?). Is my car a vampire or something?!!? i want to take it to a shop but those bastards charge like $100-$200 just to diagnose the damn problem...and I JUST got it out of the shop i don't feel like spending another several hundred right away....any ideas??? plz help..btw i live in WA state..(the car started fine last night in the cool raining weather..but not just a second ago at around 5 PM..)