I have had lots of no-blower contours lately also. All of them have been the feed for the high blower relay is burnt at the fuse box. Its a small plug in the corner with a big red wire (12 gage) and a smaller green wire. the red wire will be all black at the plug and when you pull the plug out it will be all melted and nasty. Check and see if this is the problem, if it is your resistor block is also bad, because the 3 lower speeds get power from a different source.
Not to worry if it is the problem, as it is a very easy fix. All you need for parts is a small 30 amp bosch type relay with a socket and a fuse holder. Reply if this is the porblem or not and I will tell you how to wire in the relay and fuse holder.
It could also be the blower itself is bad, sometimes turning the blower on, and smacking it with a small hammer or whatever will make them go.