Apple magic mouse not working with Macbook Pro internal trackpad

I recently replaced my T-Mobile gateway with a new T-Mobile Geteway of the same model (because of weak internet signal). It has been a disaster with our two HP wireless printers. We had to set up a separate network for the printers; this works on one printer only. I say all of this in case it has a bearing on the current problem. I have a Magic Mouse that I use with my MacBook Pro. Just recently (since the Gateway change), I have noticed that when the mouse is turned on, my MacBook internal trackpad will not work. If I turn the mouse off, the trackpad will work. I have tried restarting, re-pairing the mouse, pushing computer keypad buttons simultaneously (as suggested by some Apple articles), all to no avail. Since I have spent hours on the phone with (1) T-Mobile and (2) HP, without any success, regarding the printer issues, I hesitate to begin that process again with the mouse/trackpad issue. Any suggestions would be appreciated.