I have a project with two seperate output shift registers and they are working fine. They both have LEDs at the moment but one shift register will eventually be controlling relays and then solenoid valves to control water flow. The issue I have is when I turn the power on, the 8 channels of the shift registers are rarely in the off state. Normally some are on which is no good having the solenoid valves randomly turn on then off when power is turned on. Is there are way I can force the registers to be off when power is applied? The shift registers I am using are both 74HC595N.