How to parallel many solenoid valves?

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http://forum.allaboutcircuits.com – hi recently ,I've been working on a project in which i should parallel about 100 solenoid valves . but , there's a problem! when ever I try to turn on more than 5 valves together, my power supply turns off! i'm using a PC power supply and each solenoid needs 1 amp current to open and 0.3 amp to stay open and I'm using a (TIP122) to drive each solenoid valve. I know that the current that this power supply gives me is not enough for my project at all and also the voltage. but i can't find an easier and safer way than using these kind of power supplies. I specially shouldn't use 220V in this pr (Embedded)