Loop through every value, add it to a variable. If the variable is not 0 in the end, then they were not all 0.
Edit/ I think I misunderstood. Try
| Global number Variable1? = 0
+ Array: For each XY element
+ System: Variable1 = Array.CurX = Variable1+5
+ System: Variable1 = Array.CurY = Variable1+5
-> (no actions)