Question about IBM ThinkPad T42 Notebook

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My t42 won't start up, I think it's the battery. If the battery is old and dies, will the whole computer fail to start? I have the AC adaptor plugged in, but for the past couple of hours the battery light won't change from orange to green. And when I press start, as soon as windows loads, the screen goes black.

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  • 239 Answers

Well you need to perform a reset, how to:
Remove dead battery, plug AC, hold power button for 20 sec

Posted on Feb 08, 2010

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Posted on Jan 02, 2017

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Dell latitude d520 starts with battery but not with ac adaptor


It could be a bad adapter, a short that drags everything down when plugged in.. could be a short inside the computer doing the same thing.

Borrow an adapter to see if you get the same result, if a friend or shop will help you with that.

A digital VOM could tell you if the right voltage is being put out by the adapter. Read on it, if it's supposed to be DC voltage and you get AC, the adapter is bad.

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AC Adaptor not working in laptop


the problem is in your laptop...maybe it damaged too when you plugged your old adaptor. you should check your laptop for a repair...maybe it needs to replace tha spare parts that may have been damaged.

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Acer battery no charge/plugged in "battery is criticically low"


This is a tricky issue, it's either a problem related to the battery or the adaptor.

Try removing the battery and just plug in the adaptor and see if the computer will boot. If it does then there's a problem with the battery and you just need to replace it, if it doesn't then there's a few other things it could be.

The two most likely options is that the adaptor is bad, or the AC port on the computer has become loose. Most of the computers I've repaired that had these symptoms was that the AC port was bad if the battery wasn't. The best way to test this is to plug in the adaptor and just see if it wiggles around a lot, if it's loose then it might not be connecting to the board correctly and will need to be soldered bad on. If it's not loose then the adaptor might be bad, you can test another adaptor on your laptop or that adaptor on someone else's but be carefull, I can't stress this enough, if you're going to switch adaptors you have to make sure that the voltage IS EXACTLY THE SAME and has the same amps, if the voltage is off you can damage the computer, if the amps is off you can damage the adaptor.

If by some fluke it doesn't seem to be the battery, and you tested the adaptor and the AC port doesn't feel loose, then the charging circuit in the laptop might be shot, in which case you'll need a new motherboard.

I think that covers everything, sorry for the wall of text

Mar 01, 2010 | Acer (56.04200.H22) (5604200H22) 200-Watt...

1 Answer

My previously healthy Thinkpad T42, will not post.


Hi,
The Thinkpad T42 doesn't have a reset button on it like the older IBM's used to.

There could be a problem with the battery. With the machine turned off remove AC power and then the battery. Plug in AC power again and see if the laptop will boot without the battery.
If it boots let it load up as normal and then shut it down again, reinsert the battery and try to boot it up. If it boots fine, if not then there is a problem with the battery.

Please post back if you need anymore advice.


Good luck.

Jan 14, 2010 | IBM ThinkPad T42 Notebook

2 Answers

Laptop won't staart up.


Hi,
Yes, it should run off AC power even if the battery is removed. Sounds like either the motherboard or your AC adaptor might be failing. I would start by trying the AC adaptor with another dell to verify it it's not dead.

Good luck,
Raf

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The AC pwoer keeps on and off (most time off) all the time, however, it still can recharge the battery


This is not a good sign!
If all physical connection seems fine, it could mean something is wrong on the power modules of the motherboard! Please try another power adapter to see if it's the power adaptor's fault. If not, get it into lenovo service centre for check-up, as this could damage your laptop motherboard's power modules permanently!
This happened exactly what I had on my good old ASUS laptop, I ended up replace the motherboard. Pay little money to get it serviced before you have to replace the whole motherboard!

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1 Answer

Problem with power cord/AC adaptor...maybe?


I would just go buy another battery charger pack. They are like 75 dollars to buy. Sounds like yours might have a short in it!

Mar 26, 2009 | HP Compaq nx6110 Notebook

1 Answer

Lap top problem


Hi

If the AC power light is blinking, try the following steps:

1 Cut off power to the computer by disconnecting the AC adaptor and removing the battery. The error condition will be interrupted, and the AC power light will stop flashing.

2 Put the battery back into the computer. Do not connect the AC adaptor. Try turning the computer on again. If the computer starts normally, the AC adaptor may be
defective and will need to be replaced. If the AC power light starts flashing, remove the battery, and continue with the steps below.

3 Connect the AC adaptor to the computer. Leave the battery out of the computer. Try turning the computer on again. If the computer starts normally, the battery may need charging, may be depleted, or may be defective. Turn the computer on, insert the battery, and then leave the computer running for several hours, which will deliver a slow, steady “trickle-charge” to the battery. Once the battery has been trickle-charged, it may begin working correctly again. If the trickle-charging does not prove effective, consider replacing the battery with a new one.

4 Connect the AC adaptor to a different power outlet, preferably in a different room. If the computer starts normally, there may be a problem with the AC outlet itself, or the voltage level available from it.

5 Verify that the AC adaptor is the correct unit for your computer model. The computer may not be able to start from an AC adaptor that is rated for less current (amperage) than the computer requires, even if the rated voltage is correct, and the plug fits correctly in the DC-IN socket. The labels on the bottom of the computer and the AC adaptor show the specifications for voltage ("V") and current ("A") for each device. The voltage level must match exactly. The amperage rating of the AC adaptor must be equal to or greater than that required by the computer

Regards
Mike

Mar 21, 2008 | Toshiba Satellite 1805-S204 Notebook

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