My Dell 610c will not turn on with adapter but works fine on Battery alone. If its up & running and I plug in the adapter it goes off instantly - not a shutdown. The battery does not charge (!) and I checked the power from the adapter as 20V. The adapter light stays on when i plug it into the Laptop. But the Laptop light does not indicate power is plugged in.
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Check whether your ac adapter is working fine in the computer. Remove the battery and turn on the computer with the ac adapter alone. If it works then, there is no other thing that you can do but to replace your battery. It should be under a warranty because it's a new battery.They should replace it for free.
when you say the battery is in, you refer to battery is actually plugged in while the ac adapter are connected? it means the laptop works fine with ac adapter alone? try updating the bios download from the support.dell.com
regarding the diagnostics. the partitioned where the diagnostics should be into was might wipe out during re-installation or something.
There could be a problem with the battery. A fast check to determine whether you have a problem with the power adapter, power cord or the laptop's battery is to turn off the laptop, remove the battery, connect the power adapter, turn on the laptop & see if it works. If the laptop works directly from the power adapter with the battery removed, then the power adapter is good. In this case we can suspect that the battery is defective & needs to be replaced. To verify this, unplug your laptop & try to run it on battery only. Watch out how long it will stay on (if at all). If it didn't work on battery alone, or worked but for a very short time, then your battery is defective.
There could e a problem with the battery. A fast check to determine whether you have a problem with the power
adapter, power cord or the laptop's battery is to turn off the laptop,
remove the battery, connect the power adapter, turn on the laptop &
see if it works. If the laptop works directly from the power adapter
with the battery removed, then the power adapter is good. In this case
we can suspect that the battery is defective & needs to be replaced.
Try also to reseat the main components of the notebook: the battery, the AC adapter, the memory modules, & the hard drive. After that try switching it on & see if the problem was fixed.
try connecting ac adapter alone without the laptop, check if ac adapter light will stay green or blue. try another power outlet using the ac adapter alone without the laptop check if the ac adapter light will stay as green or blue. if all fails replace ac adapter.
if ac adapter stays green or blue try connecting to the laptop without the batt, check if the ac adapter light will stay on, if yes then try connecting ac adapter to laptop with the batt plugin check if the light stays green. if not update the BIOS. if fails replace motherboard.
Have you checked the bios battery status and bios version? first check if battery has charge if yes then update the bios. also try to remove batt and use ac adapter alone and check if laptop has sufficient power. try connecting ac adapter to a diff wall socket. if laptop works fine with ac adapter alone then batt might has problem.
remove battery check if laptop works fine with ac adapter, if not then download the latest bios version first if fails then replace ac adapter. If laptop works fine with ac adapter. but cannot work with battery alone, download the latest bios then charge the battery for 6 hrs. if still batt not charging then replace batt. but as you mentioned you already replaced the batt and your still getting the same issue. replace motherboard.