Steve,
My computer manufacturer owns stock in the electric companies supplying me power????
My old lap top would barely start, without beeping and screaming and moaning and groaning on a smaller invertor. Cannot remember the size, no matter.
Anyway, takes the 375 or close to it to run the current lap top, put the invertor on the floor board in the back, have just enough cord to reach and this Gateway has no problem.
What size screen does your new one have??? This Gateway has a 15.4 inch?? Wonder if that makes any difference in required power??