water sprinklers stopped working

i did everything what jedi said to direct link to pump and void the combiners and splitters. and still having issue. i thought maybe i had too many planters or buildings so i removed the three storie farm building and just use the one i had. im using one inground pump level 10 witch is 50 power. i have 21 level 1 sprinklers hooked up. from pump to first sprinkler gets water so does the second one rest get water but not giving planters water. out of 21 planters only four are getting water.