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1 Posts

12-19-2019

United States of America

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  • Message 21 of 28

Re: T450S won't boot, power button flashes 3 times

2019-12-19, 23:01 PM

okay so I have X1 Carbon gen 1 or 2 and I just got finished doing what you mentioned with CMOS but i did this because I bought the laptop from someone and comes to find out there is a BIOS lock on the laptop and I needed to change the boot order and add linux/Legacy to the order. So i had to go in and take the whole thing apart and the motherboard because the CMOS was on the other side of it. I finally got to it and removed it completely for about 10 minutes before reinstalling it and putting eveyrhting back. I just tried to turn it on and got nothing so I plugged it in and wited 2 minutes and pressed power and got 3 green blinks before nothing.. no power up no sounds and no blinks there after. Sooo any ideas or thoughts? Did I screw my computer up by taking it apart and taking the MB out? it was a worthless computer with supervisor lock on it so I knew that It would be worth trying anything and everything just to see. But I am assyuming the BIOS reset worked because of this change. Last 3 times i took the computer apart in attempts to reset the BIOS I put it back together and it turned on just fine but this is because I didnt actually unplug the right switch for the CMOS those first 3 times.. This last time Idid get it 100%. So I think the CMOS reset the BIOS I just dont know if I need to install new windows or what? thnaks

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466 Posts

05-28-2017

Canada

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  • Message 22 of 28

Re: T450S won't boot, power button flashes 3 times

2019-12-20, 0:33 AM

removing a supervisor lock is very difficult as the FBI and NSA have found out the hard way

I own: T400 T500 X220 running Windows 10 x64 & My X230 runs Linux for my webserver
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3 Posts

09-26-2019

United States of America

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  • Message 23 of 28

Re: T450S won't boot, power button flashes 3 times

2019-12-20, 13:32 PM

Have you tried this.  Worked for my T420 and seems to work with newer models as well.  My laptop was doing the same exact thing as yours.

 

https://forums.lenovo.com/t5/ThinkPad-T400-T500-and-newer-T/T450S-won-t-boot-power-button-flashes-3-times/m-p/3542274/highlight/true#M114057

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1 Posts

05-03-2020

Germany

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  • Message 24 of 28

Re:T450S won't boot, power button flashes 3 times

2020-05-03, 9:49 AM

Lenovo t480. Solution works. Many thanks!

 

An easy way I used was to reset the PC with a reset button, which Interrupts the connection to the internal battery. It is manageable via a tiny hole on the back side of the notebook.

 

The Way:

 

  1. Disconnect the charger
     
  2. Remove the Main battery
     
  3. Gently press (you will feel it, do not press  too hard) and hold the reset button for 10 seconds (use a bureau clip or similar)
     
  4. Put the main battery Back
     
  5. Give a feedback here, If it worked.

 

 

I hope this information helps you.

 

P.S.: Special thank to: https://blog.preiswertepc.de/mein-notebook-startet-nicht-mehr-was-nun/ for the information about a reset button

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35 Posts

04-09-2013

United States of America

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  • Message 25 of 28

Re:T450S won't boot, power button flashes 3 times

2020-05-04, 12:44 PM

Disconnecting the CMOS battery for 30 seconds worked for me as well. :)

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1 Posts

06-22-2020

United States of America

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  • Message 26 of 28

Re:T450S won't boot, power button flashes 3 times

2020-06-22, 5:56 AM
Hi, I had the same problem. Left the battery drain out during the weekend and accidentally Thinkpad had gone into sleep mode / hibernate, not shut down. On Monday I plugged it in, power button flashes 3 times and cannot boot even though I pressed power button several times. Then removed the battery, plugged back in and in a couple of moments was able to boot with the power button. (Laptop still had like 90% charge left in the battery so clearly it is a sleep mode issue or something.)
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3 Posts

09-26-2019

United States of America

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  • Message 27 of 28

Re:T450S won't boot, power button flashes 3 times

2020-06-22, 14:45 PM
Lucky you (No sarcasm). I tried that, didn't work on the T450. I had to remove the CMOS battery for a minute, put it back in, only then would it boot up. I've used a T450 for years and never had a problem. Just that one time.
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11 Posts

10-26-2018

United States of America

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  • Message 28 of 28

Re:T450S won't boot, power button flashes 3 times

2020-06-23, 18:30 PM

I just wanted to mention a thank you. Just saw this occurring with a T470P. CMOS unplug/replug fixed the issue immediately.

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