The configuration register on a 1760 was accidentally set to 0x4142. (I think, I'm pretty sure it started with a 4 anyway). Now the only text that shows up on the console screen is 1 little theta like symbol. (small circle with horizontal line). The router has no configuration currently on it. Is there a way to recover from this condition?
Given the symptoms described by Billy, I believe that the console speed has been changed. If that is true when you boot into rommon there will still be the issue of a speed mismatch between the console port and the terminal emulator.
I believe that before the confreg command is used to change the config register that Billy needs to get the speed of his terminal emulator (Hyperterm or whatever he is using) to agree with the router console port speed. Since we do not know for sure what speed it is set to, I suggest starting at the lowest speed of 1200, and incrementing through 2400, 4800, up to the max of 115200. Be aware that some terminal emulators like Hyperterm require that you stop and restart the connection for the emulator to pick up the change in speed.
And assuming that he gets the console port speed matched with his terminal emulator speed, he should then get a prompt and can change the config register without having to go through rommon.