I HAVE BOUGHT A BELKIN UNIVERSAL ADAPTER, AN IGO UNIVERSAL ADAPTER AND A BRAND NEW BATTERY ALL SEEM TO WORK INITIALLY THEN LAST NIGHT THE CORDS STOPPED WORKING AND RAN MY BATTERY CRITICAL. i PURCHASED ANOTHER BEKIN UNIVERSAL TODAY AND IT TURNED GREEN MOMENTARILY RAN THROUUGH THE SYSTEM CHECK AND SHUT DOWN UNEXPECTEDLY BEFORE I COULD SEE IF IT WAS ACTUALLY CHARGING... i HAVE REMOVED THE BATTERY AND TRIED STRICTLY AC POWER TO NO AVAIL... ANY SUGGESTIONS?
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I'm not sure exactly what "620" laptop you have, and exactly what "adapter" you're looking for, so I'll assume it's a power adapter. If it's one of the major manufacturers like Dell, Acer, HP, Gateway, etc... you should be able to find a universal power adapter from places like Best Buy or Radio Shack. I know they both normally carry a universal power supply for laptops. It's auto-voltage-sensing and comes with a bag of inter-changeable power connectors to fit most laptop models. I've seen these made by Belkin, iGo (Radio Shack), and Targus.
Try taking the battery out before you turn it on. Have seen completely a dead dead battery keeping a laptop from starting up. Does the hard drive activity light flickering? If it is you can try holding down the Function button (FN) and there should be another button to hit to switch between LCD\CRT.
To break in a battery for Acer, you have to charge it up, then let it run down completely 3 times! The battery only has a 300 recharge life, so you must never leave it in your Acer when you are plugged in. Use it only when you need a battery, then take it out. Be sure to use it set for battery use, with minimum drain. only recharge it after it is exhausted. It sounds to me as if you bought a bum battery.. Call them, and ask for a replacement.
The Aspires should have no issue booting without the battery installed. Have you done a static reset? (i.e. hold the power switch for 20/30 seconds without power or battery in) And the voltage range on the Aspire 5100 should be +19v - +20.5v on the inner part of the connector so it might be worth checking that the power adapter is outputing correctly.
If it works without battery, then it can be checked by testing the voltage between pins 1 and 6 on the battery (the ones either end) and should be 7.5v or above if the battery is charging correctly.
Hope that gives you a starting point, if you've done all those things already then appologies and best of luck with it.