Sounds like the radio was subjected to electrostatic discharge. If you have your manual, and it describes a way to do a "master reset" on the radio, follow the instructions. This usually involves pushing down on one key while turning the radio on. Otherwise you have to find a licensed dealer for factory service, as there is no way to repair the radio yourself. The use of surface mount technology still confuses many Techs unless they have been to a company's two or three week seminars.
Be sure the tone codes and channel frequencies are set identically on both units.
I have the same walkie talkies and on mine I can hold down the mode/lock button and it will come off of the Rx mode. Also, you should be able to press the talk button and it will come off of the Rx mode.
This is more for "mshtexas" than the OP but I'm sure there may be others out there wondering the same thing. The power cord that comes with this unit has a 9.0v output at 200mA with the center pin being positive
Hmmmm maybe your keypad is broke or your radio is locked
This was extremely difficult to find but I have located the manual for you on these walkie talkies. It will be easiest to just use the manual and follow the instructions. If you still have questions or problems please respond here and I will get back to you. Please rate my answer 4 thumbs up here on the site, it is very important to me. I would be forever grateful. Here is the manual: