Ok, well I dont know 4 sure, but my guess is that YES you can use any brand. 2 things to make sure of first. 1) Make sure you get one rated at the same amount of watts or higher, than the last one. 2) Make sure Gateway doesnt use any SPECIAL connectors that a standard PS might not have. You should check documentation and physically inspect it. If all is ok, go get a new one.
Alot of vendors have propierty P/S's... it might power the system but due to design...(IBM AND COMPAQS are famous for this) the P/S will not fit the into the system case....even with the right connectors
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