Question about IBM ThinkPad T21 Notebook

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Laptop won't boot

When I try to start my IBM T21, I get nothing but a millisecond green light on my hard drive icon on the keyboard. I've tried with and without a battery, and have tried a different DIMM. Could this be my CMOS or maybe the MB gone bad (the battery does charge)? Thank you...

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Re: Laptop won't boot

This could be an indicator of one of two things: 1. Bad motherboard 2. Short circuit. If you can, disconnect the CD-Rom drive, hard-drive AND the keyboard if possible. If you turn the laptop upside down you can normally see the screws relating to each of these components. Do one at a time and test to eliminate them. M

Posted on Aug 21, 2007

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Need info about series

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IBM -t21 does not boot (all the time)

I am wondering about the environment in which you normally use this unit, which is heat sensitive, and
which, after it cools off a bit will work as you say after it is allowed to dissipate heat after use.

Make sure the space in which it used is not overheated and preferably air-conditioned. Try to maintain
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How large of a hard drive is supported on the ibm t21

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IBM thinkpad T21 overheating?

Does the battery get very hot? If so try running the laptop with it removed! This problem might also caused by a faulty heat sensor on the motherboard. Given the current cost of new laptops I wouldn't spend a lot of money on any repair options, but you could invest in a "laptop cooler" or chill mat see this link

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Remove any devices connected and power it on by itslef, either on battery or power source, if it doesnt work, it may have bad processor, When they go bad most laptops wont boot period.

Feb 18, 2008 | IBM ThinkPad T21 Notebook

3 Answers


i have the same problem. actually its a common problem for many T21 and other old IBM laptops.
i searched that you have to take all power (batery, adaptor)
press the power 10 times and press it for 30 secs then reinsert the battery or adaptor and try to power it on.
they say its done to discharge a certain capacitor that got overcharged after overcharging the battery.
that worked for me before but now my T21 wont start any more with this process.

May 20, 2007 | IBM ThinkPad T21 Notebook

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IBM T 42 - Not starting

If the laptop is not even getting to boot the hard drive, then their may be a problem some where on the motherboard and it may need to be replaced. Before replacing the motherboard, there are a few things you can try. 1) If you have extra memory, try swapping in new memory and see if the laptop boots then. 2) Try disconnecting all peripherals and add-ons and see if the laptop boots then.

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