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08-08-2014

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T400 boot up issue

2014-08-08, 16:45 PM

Fell asleep last night on my bed with the laptop on, unplugged, woke up this morning to see that it wouldnt pass the "ThinkPad" bootup screen. There a way I can easily fix it without sending it into a shop?

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527 Posts

07-03-2009

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Re: T400 boot up issue

2014-08-08, 17:59 PM

If you have the laptop plugged in, does the battery light blink indicating it is taking a charge? If that's the case, charge the battery to 100%, remove the battery and unplug the computer. Press the power button 10 times slowly holding it down for 15 seconds the last press. Wait 30 minutes. Now reinstall the battery, plug the AC in and give it a go.

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08-08-2014

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Re: T400 boot up issue

2014-08-08, 18:13 PM

No, its all black, no light or anything

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278 Posts

12-15-2012

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Re: T400 boot up issue

2014-08-09, 0:52 AM

wrote:

Fell asleep last night on my bed with the laptop on, unplugged, woke up this morning to see that it wouldnt pass the "ThinkPad" bootup screen. There a way I can easily fix it without sending it into a shop?


Hi, try this:

 

But first, a WARNING. PROCEED AT YOUR OWN RISK. Especially if you purchased this T400 used, removing the CMOS battery can cause a nasty surprise upon reboot if a previous owner has placed a supervisor password on the machine. If so you will find yourself locked out of your own machine (and your machine will be unuseable in that state/ will not allow you to proceed further & you will only have a couple limited/difficult/expensive options at that point).

 

So proceed at your own risk and decide if you want to try this (simple) procedure: Touch something made of pure metal to discharge static electricity from your body, unplug AC adapter, remove main battery. [ *** And make sure you're using same known good memory modules which worked previously]. Then follow procedure in T400 videos/movies/manual linked below to remove/unplug little yellow (nickel size) CMOS clock battery (also referred to as "BACKUP BATTERY"). Wait about 30 seconds. Then, replace CMOS/BACKUP battery, plug in keyboard and palmrest properly. Then power on the laptop and see if screen begins to display and post to BIOS.

 

Reference:

T400 Hardware Maintenance Manualhttp://support.lenovo.com/en_US/detail.page?LegacyDocID=MIGR-70069

and some helpful Lenovo Training videos here: Hardware Removal & Installation Movie Index - Notebooks

 http://support.lenovo.com/en_US/product-and-parts/detail.page?&LegacyDocID=TPAD-MOVIES

T400 videos specifically: http://support.lenovo.com/en_US/product-and-parts/detail.page?&LegacyDocID=MIGR-71461

_________________________________________________________
Have a great day. (I do not work for Lenovo)
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