A lot of the Gateway's (or dells or compaq's) use powersupplies that are of a strange size compared to most computers, so you should probably measure it and make sure that you can replace it with something that isn't from Gateway.
But in order to test if it really is the power supply, you need to purchase a power supply tester, or be fairly skilled with a multimeter. I bought a power supply tester at my local compusa (read: I overpayed) for around $20, so if you do much work on computers at all, it's a pretty good deal.
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