T420 stuck on the startup Lenovo screen

Hi I'm new to this community, so I would like to applogise if I have something simillar to mist (I checked some but not solved my problem).

I have a thinkpad t420, I bought a used one. It worked great, and I bought a friend, that I trust. I installed an SSD, was usnig Linux, and everything worked for a month. But then I bought a HARD drive caddy and replaced the CD-ROM. After that my thinkpad has worked for a day (although he does not recognize the second HDD). The next day, I tried to find BIOS for some parameters and after I restarted my laptop, it was stuck on the startup Lenovo screen, reboot loop. I tried:

-removing and replacing the caddy with the CD rom.

-replace my SSD drive,

-replace the RAM (two locations),

-Reset BIOS,

-launch a diagnostic CD (but it does not start, nor can I boot from a USB key)

My google search showed that he could bi a problem with one of the USB pins inside one of the ports (short circuit or something like that), but I couldn't find any damage. So I'm thinkig that the motherboard may be damaged, but I can access BIOS, but it's the only thing I can do with it.

I'd be thenkful Walker of any advice or help, before moving on to official Lenovo service for help. Thnak you!

Z.

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

Tags: ThinkPad Notebooks

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