Hello there,
If anything else is failing try the following:
* Conect to the router using console port and cable
* Open a new session in your hyperterminal
* Change the baud speed to 1200
* Power cycle your router
* As soon as the router is coming back press the space bar on your keyboard for at least 15 seconds, not just a hold down but strokes
* Once you see garbage on the hyperteminal window close that hyperteminal session and open a new one at 9600 baud speed
* Now you should be in rommon mode for sure.
Cheers and good luck