Hi!
No! You were *definitely* correct. I'm here to say that substituting laptop power supplies between different models and makers (as long as the connectors are completely compatible!) is generally OK as long as you have checked the voltage (both listed and what is actually being put out when unloaded), current rating and polarity *first*. The voltage should be exact and the polarity had better match as well. Current supply can be higher or equal to what the computer expects.
There is some leeway in most designs for current draw and possibly voltage, but you can't always count on this and won't find it documented anywhere short of personal experience.
If you don't check these factors before plugging things in, you're looking at the possibility of causing anything from instant destruction on up to slow cumulative damage to the computer.
William