02-17-2015 11:17 AM
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!
Solved! Go to Solution.
02-17-2015 10:45 PM
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!
02-19-2015 10:54 AM
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...
02-19-2015 10:55 AM
02-19-2015 11:23 AM
02-19-2015 11:35 AM
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.
03-05-2015 08:08 AM
03-06-2015 05:44 PM