So I had the ISO file with me which I've used for installation, installed quickhash and checked integrity of iso file, it matches the hash checksums listed in zorin website. also I remember I didn't skip filesystem check during installation. also, unlike the flashing issue that I,ve had in previous post, now the system doesnt't boot up at all. it stays on the screen in picture, and it have be forced shut down(pressing power button for 5 sec) and power on the system.
it is very wired for me. 2 systems, one T470 , another L470, nearly identical specs,installation using same Iso and same usb stick at nearly same time, one running without any issues, another facing a ton of issues during boot. When it successfully boots up, it runs too smooth to be told to have some issues. I wonder how such system may have a hardware issue.
Next week I'll go home and try to reinstall plymouth as aravisian mentioned. If that doesn't work, I'll open it up. till then If anyone see any other possibilities, please share.