2 green lights flash on the furnace, but the blower want come on. It clicks like its going to come on but don't

I had a similar problem. Check out the process and disgnosis: https://www.askmehelpdesk.com/heating-air-conditioning/inside-blower-starts-after-several-clicks-384277.html
See if you can hot wire the fan directly. If that works you can try other areas.