First try to reset the power manager unit. To do the reset:
1- If the computer is on, turn it off.
2- Disengage the two keyboard latches located between the Esc and F1 keys, and the F11 and F12 keys. (You may also need to disengage the keyboard locking screw located between the F5 and F6 keys.)
3- Lift the keyboard. To ensure no harmful static electricity is transferred to the computer, properly ground yourself before performing this procedure.
4- Press and release the reset button located on the upper right side of the logic board near the power button.
Wait 5 seconds.
Press the power button to restart the computer.
You may also do a PRAM reset by booting the computer while holding down the
COMMAND->OPTION->P->R keys until the computer chimes 3 times.
If nothing works and since your Ti has a PCMCIA slot you can buy a USB 2.0 PCMCIA card that will be a substitute for your USB 1.0 ports. The negative side of the PCMCIA cardbus is that the USB ports are not self powered.