I have an 2006 Infiniti G35 coupe... the other day I was getting ready to run a few errands I started my car and sat in idle for about 3 mins all of a sudden I hear this weird noise that sounded like a video game it came from the far right side where my clock is located, along with the noise there was this flashing blue light..can anyone please tell me what this is?

 

I've never seen a flashing blue light on the inside of my car so I don't have a clue. Probably something aftermarket is my guess maybe related to an alarm system?

 

This is the light..I have never seen this light before,when I start the car this is what I see along with the weird noise after that the light goes off but it just beeps every 5 seconds..is there a way I can upload a video?

 

https://youtu.be/v0i1g1I2y9w

 

That definitely looks like an aftermarket part. I'm guessing an aftermarket alarm.