2007 nissan altima won't blow any air at all. replaced the air filter and the cabin air filter but still not blowing any air at all. checked the fuses but all good. what should i do?

Are you talking about front hvac blower motor? Note the diagram, did you check voltage and ground circuits, use a test light. Any applicable trouble codes? See the two fuses under blower relay, check for voltage, use a test light, hvac and blower controls on. You can also check voltage and ground at the blower motor itself.