It works great on ac adapter as long as the battery is removed. As soon as I instal the battery, the screen locks up. When I start it with the battery in, the screen won't light up, but the fan runs. I have tried a new battery with the same results.
Oh dear! My best guess from the information you've provided, is that possibly the charging unit in the laptop is faulty?
It really sounds like there is a short-circuit somewhere. I've come across many, many laptops that have faulty charging units... they still work from the mains just fine, but they won't charge a battery. I think yours could be trying a little too hard to charge your battery.
In any case, there is no software or hardware settings that can cause this, and you've eliminated the battery from the equation... so you're left with the laptop being faulty. I'd get a tech to put a multimeter onto the contacts in the battery compartment to see what kind of voltage it's putting out... or if it's grounding somewhere. (which would explain why inserting the battery locks the poor computer up!)
I'd probably start by holding the negative tester to the first contact, set the multimeter to the 20v range, and then use the red positive tester to check each contact as you go. Some should give no voltage, meaning you have positive and positive or negative and negative, others will give positive/negative voltage, indicating that the two contacts are giving positive and negative power. If it's negative voltage, you know that your black and red testing probes are reversed... switch them around, resest and you will have positive voltage.
Write down all the contacts, then you know what the laptop battery compartment should be putting out too! If any differ in the slot, then you know there is a short.
Honestly though, after all this... you might or might not find a fault with the laptop... then what? I think you'd still need an electronics technician to fix it anyway. Best off getting a quote and seeing if it's even worth your time for someone to look at it and possibly fix it.
Sorry I can't be more helpful, but it's probably something way out of our hands to fix via these means. =-[
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Bummer to be me. I was hoping for software!
The batteries have about 9 contact slots that flat tangs connect into when it is installed. Any clue how I should find out which pins to check?
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