If my memory is correct, there is a "blanking" signal that is supposed to keep that from happening. If that signal is not working, then you get all of the solenoids firing at power up and it could possibly blow the solenoid fuse. The blanking signal is part of the power on reset circuit and it continues through the infamous 40 pin connector to the driver board. The blanking signal is an easy trace to break (or cut) when you replace that dreaded 40 pin connector. Make sure that that signal is working on the driver board, you can use an Ohm-meter to verify that the continuity is there.