If the adapter is fancy enough, it could have some sort of protection from unexpected currents. Usually, this is implemented as a short circuit protection, so if you're incorrectly measuring current, you could be tripping it.
What load did you use when measuring the current on the adapter? Also, how many watts/amperes can the "faulty" adapter provide and at which voltage?
Here are some simulations showing how to properly measure current and voltage
Here we see power supply V1 at the left connected to the load R1 on the right. Meter XMM1 is connected in parallel, with its positive lead to supply's positive side and its negative lead to supply's negative lead. Ground is there because of the way program runs its calculations. We get 19 V.
Here we see how to properly measure current. Meter is connected in series with load, so current goes through it and then to the load. We have to actually cut open a piece of the wire and connect meter there! This isn't very convenient for most power laptop power supplies. The current is around 4.5 A, which is the maximum value of my power supply.
Here we see the incorrect way to measure current. If we remember Ohm's law, current is voltage divided by resistance. Since ammeters are designed to be connected serially into the circuit, their resistance should be zero. That means that current through ideal ammeter should be infinite! In this simulation, we have a nearly ideal ammeter and power supply, so we have 19 GA! Of course, realistic power supplies can't get anywhere near that (power plants make current in kA ranges) and realistic meters have much higher resistance. So in real world, this would catch on fire or blow a fuse.
Here's a nice video showing what could be happening with components of power supply improperly connected: http://www.youtube.com/watch?v=JCPXckfT-6g
Here's a nice video showing how to correctly use a multimeter: http://www.youtube.com/watch?v=bF3OyQ3HwfU
To cut the story short, since you mentioned in the other question that you can't get even LED to light up, you probably ruined the power supply and there's a chance that meter's fuse could have blown too.