Same Problem with my TS-473
Bios access with no problem..
As soon it boots... freeze...
If you select boot always from certain USB, you can see the Ubuntu menu... but it freezes a sec later...
But if you are fast to select anything.... there is a chance to run Ubuntu... works 1 out of 10 times...
If Ubuntu is running, I didn't see any freeze or something else...
What Bios are you running? Are there any differences?
Bios Information
BIOS Core 5.12
Compliancy UEFI 2.5; PI 1.4
Project Version QY03AR53 x64
Maybe a similar Problem like the TS-453 Pro has... To fix it you need to solder a resistor to the board it works again, like nothing happens before...