Question : Problem: power adaptor replacement

Does anyone know where I can get a replacement power adaptor?

This would be for a Gateway laptop model 3018GZ S/N n6451 010 46968

Answer : Problem: power adaptor replacement

You are looking for a 19 VDC, 3.42A, 65 W output power supply. If it has a regular plug at the side of the laptop, you can probably find a generic power supply that will work. If not, go for second hand or order from Gateway.

Here are the specifics of your laptop:
http://support.gateway.com/s/Mobile/Gateway/3000Series/4386sp3.shtml