Model: Gateway 7405 GX notebook.
symptoms: starts and works fine on battery power, yet not on external power.
This is a recent occurence. It just started yesterday to be exact. Other then the AC adapter being faulty I'm at a loss for explaining this. Although, I fear that the adapter may not be the problem, when I hooked it up to a multimeter it seems fine. I am getting a steady reading of 18.75 volts DC. The adapters output is listed as 18.5 V so this seems to be an indication of proper operation. Another concern I have is that most adapters will put out more voltage then what is listed on the unit so it is possible that the adapter is bad.
With the AC adapter conected, the pc off, and battery removed the AC power LED is lit. When I attempt to start the system sometimes I'll get a flicker of power (power LED turns on monitor flashes) then nothing. Other times the pc will start to boot, the screen will flicker a few times then it will shut down.
Keeping in mind that under battery power all is normal what could be the problem?