"There is no screen to be attached matching miner" means you did not configure your email right on the USB stick, or if you did, you need to login on simplemining.net with your email, and configure your rig.
Thank you so much Rcalin, miner_cuc and Squintz - with all your guys suggestion and experience.. I managed to make it work!!
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Can you share the bios setting with TB 250 pro?
I get it run to the option
Ubuntu
Advanced Ubuntu Options.
Whatever i choose, the screen is black. Not sure why but i will try to reimage smos to see it helps.
Thank you.