2000 chevy blazer here. I recently replaced the factory stereo with a new one but I cannot seem to get sound out of it even though I have power. This is my first real project I have done on my blazer so it may very well be caused from something stupid I just didn't know about

 

Aftermarket radio?

 

In case you don't have this I would doublecheck your connections using this wiring diagram for model years 1994-2004. Scanned from Hayne's manual and you'll have to rotate it (scanned upside down).

 

I tried to use that but it isn't fixing one of my problems which is I have multiple of a few colors like dark blue and dark green. No clue what to do with them

 

Ive always bought the installation adapter makes joining wires way easy and always works for me ....cheap cheap as well.