Adding new yeast.

[logicalmaniac]

If I have to add more yeast, because fermentation has not started due to dead yeast, do I aerate the wort when doing so? Or would oxygen be bad at this point?

My wort has had no activity for almost 36 hours.

 

[joyceman]

did you aerate before you pitched the first time?

 

[BrewinHooligan]

It can take up to 72 hours for the yeast to take off depending on a number of things. Wait another day before doing anything. If there still appears to be no activity in a day, check your gravity to make sure fermentation is not actually happening. If nothing is truly happening, aerating and pitching new yeast would be the right thing to do.