Inherited a Compaq Presario 700 which originated in the States. It came with it`s own charger and has a 100v input with 19v 3.16A Output. It has charged successfully many time in the UK with a US/UK travel adapter.
By coincidence I also had an AC Adapter for a Lexmark printer and in haste plugged this into the Presario! Input 220v Output 30v 500mA.
The Computer won`t start or charge the battery and the proper Compaq charger reacts as follows. When connected to the computer the LED flickers dimmed. When not connected but powered the LED is illuminated green OK.
Nothing I`m afraid. The power LED on the AC adapter changes from green to dimmed and nothing happens to the laptop. i.e. the power buttons don`t light up and it won`t boot obviously! I think I`ve done some damage but to what extent I don`t know. Could I have blown a fuse in the laptop or have I "Fried" it? One is simple to solve and the other is not!
(Personal pride and self esteem is also damaged, not sure to what extent on both those counts either)
It is probable you have damaged components but as a long shot disconnect the A/C power adaptor cord, remove the battery, and hold the Power button for 30 seconds. Reattach the power cord, and turn the notebook on. This will discharge and recharge the notebook system capacitors.