T41 won't run on AC only or with fully charged battery

I just got a used T41 laptop and have a weird problem. It runs fine on battery only or with a partially charged battery. But when I remove the battery and try to run on AC only, I get the "charger removed beep and screen flash warning" over and over again. The same thing happens when the battery is installed and reaches full charge. As it approaches full charge, I'll get the warning once in awhile. But once it reaches full charge, or with the battery removed, it happens intermittently, every few seconds.
If I turn off the "Power Control" alarm in the BIOS, I don't get the beeps but the screen still flashes. Also, the alarms start before the OS is loaded. They occur even at the first screen where it allows you to press the IBM Access button. It seems to be some sort of "over voltage" alarm. I have Grub installed for dual booting XP and Linux and while Grub menu is displayed and I turn the LCD brightness up and down, the alarm frequency increases as I decrease the brightness.
As it stands, I can only use the computer by unplugging the AC when the battery reaches about 90% charge, running on battery only till it drops to about 20%, and then plugging the AC back in. Frustrating!!!

Thank you for the information that does me no good at all. I only paid $75 for the laptop and it will allow me to sell a good working Acer laptop for much more money. I can put up with the inconvenience with my personal laptop. In fact, it works quite well with just a 12v battery connected to the AC connector. With only 12v applied, instead of 16v, the over voltage sensor doesn't kick in. There are always several approaches to any problem and I was hoping someone here in the forum had one more elegant than mine. If not, I can live with mine. No way is replacing the MB a solution.
Thanks anyway
Lew

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T41 won't run on AC only or with fully charged battery

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