Power window on my 2000 chevy silverado z71 won't go up

I also had the same problem on my 2000 Silverado 1500 Z71....on both doors!!! I found the best solution (even though I didn't have the money) was to get it fixed by a good mechanic who wouldn't screw up anything else in the process. Passenger side went first...then a year later, drivers side fell half way down. He researched the solution on his own...found out you have to buy the whole window motor assembly. After labor....300 bucks each window...OUCH!!! Bought my truck new in 2000. Window problem happened in 2006 then in 2007.