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Try another 19volts adapter. If problem still the same and the laptop not powering-on, there's something wrong with the motherboard circuit and not the DC JACK cause it indicates that you connect an adapter.
When u power up the computer press "del" or F2 key then check your harddisk is detected or not. Also load optimal defaults settings. then restart the computer press F8 key then enter in enable vga mode.then change screen resolution to 1024*768. Please let me know.
I had the same thing happen to my computer 7330 gz and all the trouble was caused by a faulty ac adaptor. Battery wasn't holding a charge either because it's 3 years old and worthless. I got a replacement adapter at best buy for 100 buck and it's universal. Fixed it up just fine and now I'm sharing my solution with you!
The most common problem is the plastic that covers the switch breaks. It's a poor design. Take out two screws along the top edge from the bottom near the middle and pry off the keyboard access cover. Then take off the circuit board and you should be able to turn it on and off.