My R40 ThinkPad will not run on battery power and yes it is a good battery which works great on other notebooks. The power indicator light in the back shows orange at all times and never shows charge (green), the notebook was working fine and sat for a couple of weeks, now the battery issue.
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Re: R40 2724-BU1 Power Problem
Check the ac adapter. It seems your adapter is not charging it. Either the ac adapter or your dc port may be the problem. Is this the correct adapter, is it giving the correct voltage. These should be considered also.
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try remove battery and charger then press power button for 25 seconds - then if work good! - if not do OKR - OKR not working use recovery disk - still not work call thinkpad and let them create a depot service for you
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.
Some times a battery can pickup a dead short, and even though it shows a charge it will not work. The other possibilty is the power management chip on the mother board. This chip allows the computer to charge the battery and switch from battery to AC. (Right now I have a Thinkpad that will only run on battery, bad PM chip) Try replacing the battery first, if that doesn't work, then unfortunately the motherboard will have to be replaced.
Usually, hitting the 'F7" button while holding down the 'Fn' button (function button) will brighten your screen.
Also, if you're running on battery, to conserve battery power, most notebooks will dim the screen... you can override those settings by going into the control panel and into the power settings (easiest found on the old 'classic view').
If none of that works, your video display could be starting to go bad. Let us know how you fare and we'll go from there!
Remove the battery. Check for voltage at the connector of the AC adapter. Plug adapter
into the lap top and turn on. If it runs, yes, a new battery is needed.
When power up is attempted, does it make any sounds, can you hear the fan running or do any of the indicators light up? If so, you are getting power to the laptop. If not, you probably have an internal power supply problem.
Your machine should run without the battery, just plug it into the power supply. You may check the powersupply itself. Maybe the power supply was bad and not the original battery. You can pickup one at a computer store. A universal costs around $100.00 to $120.00. The power supply is the (usually) the rectangle box that is part of the power cord.
Let me know if that was it.