I'm not familiar with 2.5.5, but there is code in 3.0 rc.sysinit which detects which hardware it is being run on. If it detects US hardware then it runs palmod.

Check the code.

When you say there is no live TV is the sceen blank or do you have the no signal detected message. from past memory when a PAL signal is input to a US TiVo in NTSC mode, you get the message screen.

HTH

Peter