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zjaz123456
Paper Tape
Posts: 7
Registered: ‎02-17-2015
Location: Maribor
Views: 5,109
Message 1 of 12

T420 stuck on Lenovo splash screen

Hi I am new to this community, so I would like to applogise if I mist a simillar subject (I did check some but non resolved my problem).

 

I have a thinkpad t420, I bought a used one. It worked great, and I bought it from a friend, that I trust. I installed a ssd drive, was usnig Linux, and everything worked for one month. But then I bought a HDD caddy, and replaced the CD rom. After that my thinkpad worked for a day (although it didnt recognize the second HDD). The next day I tried searching BIOS for some settings, and after restarting my laptop it was stuck on Lenovo splash screen, rebooting in a loop. I tried:

- removing and replacing the caddy with the CD rom,

- replacing my SSD drive,

- replacing RAM (both slots),

- reseting BIOS,

- running a diagnostic CD (but it will not boot, neither can I boot from an USB)

 

My google search showed that it could bi a problem with one of the USB pins inside of one of the ports (short circuit or something like that), but I could not finde any damage. So I am thinkig that the motherboard could be damaged, but I can access BIOS, but that is the only thing I can do with it.

 

I would be wery thenkful for any advice or help, before I go to an official Lenovo service for help. Thnak you!

 

Z.

Retired Support Specialist
Posts: 3,015
Registered: ‎03-14-2014
Location: Bangalore
Views: 5,098
Message 2 of 12

Re: T420 stuck on Lenovo splash screen

Hi Zjaz123456,

 

Welcome to Lenovo Community!

 

As per the query we understood that you are facing issue with not booting to OS on your ThinkPad T420.

Is both HDD &SSD detecting in BIOS?

 

Check with removing CMOS battery, make sure you have disconnected the system from AC adapter and battery is removed.

 

Remove both the drive & battery from the system, disconnect the power adapter. Press and hold the power button for 15 to 20 sec perform this step for 2 to 3 times and then connect only the drive which is having OS installed in it. Use only power adapter to switch ON the system.

 

Hope this helps. Do post us back for further assistance!

 

Best regards,

Hemanth Kumar



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zjaz123456
Paper Tape
Posts: 7
Registered: ‎02-17-2015
Location: Maribor
Views: 5,071
Message 3 of 12

Re: T420 stuck on Lenovo splash screen

Hi, it took me a little while to answer.

 

I have tried every thing you mentioned, no success. Both my drives are detected in BIOS (so is everything else). In BIOS, everything looks as it should. I even tried disabling USB, and other I/O devices. The only thing that made some progress (although not actuall progress), was when i set boot settings from express to diagnostic (in BIOS), after that I got past the Lenovo splash screen, and a line appeared saying: "ThinkVantage Active Protection sensor diagnostics start. /", and after that the thing reebots again... 

 

Any ideas, I am not sure that this could be the motherboard, because BIOS works, and detects everything as it should... 

 

TNX

Guru
Posts: 9,598
Registered: ‎12-26-2009
Location: CA
Views: 5,069
Message 4 of 12

Re: T420 stuck on Lenovo splash screen

If you pull all of your storage drives and try to boot, does it error out properly beyond the splash screen?

W520: 2960XM, Q2000M @ 1091/1380, 32GB RAM, 500GB&750GB HDD & 500GB SSD, FHD&MB168B+
X61T: L7500, 4GB RAM, 500GB HDD, XGA screen, Ultrabase
W550s: 5600U, K620M at 1164/1281, 16GB RAM, 512GB SSD, 3K touchscreen
X200s: SL9400, 6GB RAM, 64GB SD card, WXGA+ screen
TPT1: 1839-23U
zjaz123456
Paper Tape
Posts: 7
Registered: ‎02-17-2015
Location: Maribor
Views: 5,064
Message 5 of 12

Re: T420 stuck on Lenovo splash screen

I removed my drive - SSD, (at this point i dont use the caddy any more). And no error, same as before. It seams like it doesnt even get to booting or checking for drives.

Guru
Posts: 9,598
Registered: ‎12-26-2009
Location: CA
Views: 5,062
Message 6 of 12

Re: T420 stuck on Lenovo splash screen

Can you examine the pins on the UltraBay connector on the machine for damage?

Does the machine boot if you leave it at that screen for an hour or so?

W520: 2960XM, Q2000M @ 1091/1380, 32GB RAM, 500GB&750GB HDD & 500GB SSD, FHD&MB168B+
X61T: L7500, 4GB RAM, 500GB HDD, XGA screen, Ultrabase
W550s: 5600U, K620M at 1164/1281, 16GB RAM, 512GB SSD, 3K touchscreen
X200s: SL9400, 6GB RAM, 64GB SD card, WXGA+ screen
TPT1: 1839-23U
zjaz123456
Paper Tape
Posts: 7
Registered: ‎02-17-2015
Location: Maribor
Views: 5,059
Message 7 of 12

Re: T420 stuck on Lenovo splash screen

I already examined all the pins (UltraBay, USB, every connector I could find), they all look ok to me, no short circuit.

I didnt try to leave it on for so long, because every time it reboots and starts all over, didnt think it could change. I left it four about 10 reboots, but that is it.

zjaz123456
Paper Tape
Posts: 7
Registered: ‎02-17-2015
Location: Maribor
Views: 4,989
Message 8 of 12

Re: T420 stuck on Lenovo splash screen

Hi! just to update this thread (with a really sad face).

I went to the official Lenovo service, they took it in, and my worst fears came true. The motherboard is faulty, and a new one would cost me around 420€ + tax. And the worst part is, my warranty expired in october 2014 Smiley Sad... so thats it!

Thank you for your help and advice! Smiley Happy
Guru
Posts: 9,598
Registered: ‎12-26-2009
Location: CA
Views: 4,973
Message 9 of 12

Re: T420 stuck on Lenovo splash screen

You can always source a new mobo on eBay, or part out your T420 to recoup some costs.

W520: 2960XM, Q2000M @ 1091/1380, 32GB RAM, 500GB&750GB HDD & 500GB SSD, FHD&MB168B+
X61T: L7500, 4GB RAM, 500GB HDD, XGA screen, Ultrabase
W550s: 5600U, K620M at 1164/1281, 16GB RAM, 512GB SSD, 3K touchscreen
X200s: SL9400, 6GB RAM, 64GB SD card, WXGA+ screen
TPT1: 1839-23U
zjaz123456
Paper Tape
Posts: 7
Registered: ‎02-17-2015
Location: Maribor
Views: 4,945
Message 10 of 12

Re: T420 stuck on Lenovo splash screen

Yup... I'm thinking about eBay as my only solution. 😁 tnx for help guys!

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