AC Adapter not charging

SOURCE: Periodic Boot-up Problems with Dell Latitude D600

Well I had the same problem with my Dell Latitude D600. I tried many batteries, fully charged, partially charged and even i tried scenarios with AC Power On or Off. Nothing really seemed to work as my laptop was both hot and cold. I noticed this problem was coming specially when laptop is cold.
The Solution is found is, when i have this problem, i press the power button and then move the rotate the laptop, so that its screen touches the desk and keybord is upright verticle, i know it sounds ODD, but it really made my life so easier as now this problem doesnt haunt me.  and it will boot on first, second or third go.

Normal Laptop Condition with keybord down and LCD Open
                     /                     /      / lcd
__________/
You need to move the laptop in one of the following if it is having boot problem again
       \               /          \            /            \         /  keybrd  \      /  lcd                \   /                 \/
or put the lcd down flat while keeping the keyboard in the same position as above.

I m sorry the above illustrations are pretty rough but hope u understand what i mean :)

SOURCE: Dell Inspirion 1526 Laptop Battery is not charging

Sound like the battery. Take the battery out and there should be a power meter on it, press it, if there are three lights that flash, the battery is shot. Not all batteries will flash if they are worn out, but they are supposed to. Try a new battery, I believe this will coorect the issue.

SOURCE: Dell Latitude D600 won't accept charger

Had the same problem, My other Dell charger would work fine but the original one that came with this laptop would throw an error message that the Charger wasnt recognized. None of the suggestions on the forums worked.
I held the chord by the circular flex thing at the end, and pushed in the power pin with force into the laptop, held it for a few seconds and now it works fine. If you push the pin slow and gently into the laptop, it doesnt recognize the adapter. I think the problem is either with the power chord connections inside or with the adapter inside the laptop. Try it!

SOURCE: Dell 1501 Error- AC Adapter is not recognized

myabe the battery is faulty have you tried replacing it?

Testimonial: "Don't have an extra battery to test so was hoping the error was causing the battery not to charge. "

SOURCE: My Dell 5160 laptop slows down with the AC adapter plugged in.

try running ur laptop using the adaptor without the battery in it's place and run it with just the battery...note the difference....it may be a power surge/short issue....some times the battery is supplying power along with the adaptor to the notebook and the power circuit in there is not able to take dual power....check your power options setting in Control Panel...

also do this

clean ur system use Tuneup Utility get it from my website Dowload page
www.sureshayyar.110mb.com
use all the tools and option in that tool...the best is 1n Click Maint in there .....it fixes all ur issues...