|What specific model is your Gateway?|
It's usually on a label on the outside of the case somewhere.
Try the mice on another computer.
The USB controllers must be enabled in the mboard's bios Setup for all USB devices connected to the mboard USB ports (on the back of the case) or USB mboard headers (at least the ports at the front of the case) . They are by default, but if they aren't you either have to go into the bios Setup by connecting a PS/2 keyboard and enable the USB controllers, or - with the AC power to the computer off, you have to remove the mboard battery, install it it again, or move the clear cmos jumper, move it back, which sets the bios to defaults, restore AC power to the computer, you'll get a "Cmos Checksum Error" or similar message, and either go into the bios Setup, set the date and time, or continue on to Windows, set the date and time.
USB devices may not work correctly when they're connected to certain USB ports, e.g. ports in a hub or on the front of a desktop case.
See response 3 in this:
Wireless mice and keyboards often require you install software for them, you MAY be required to NOT plug in it's receiver/ transmitter into a USB connection until AFTER at least some of the software is installed, and for some wireless mice, you MAY have to do something in their configuration software, and/or active a tiny switch on the mouse, before the wireless mouse itself will be recognized in Windows. Some wireless mice also have a tiny switch so they can be turned off to conserve the batteries - if it has that, that must be on, of course, when you want to use the mouse! See the instructions for installing the wireless keyboard or mouse!
In any case, the FIRST time you connect a wireless mouse, it will NOT be recognized until AFTER the desktop screen has loaded, and Windows has detected both it's receiver/ transmitter and the mouse itself.
The same applies the FIRST time you connect a USB corded mouse, if another type of mouse (PS/2 or Serial) was used previously.
If you need to login in while booting and the mouse cursor is not there, or it is but it won't move, use the Tab key to toggle selections, possibly cursor keys, Enter to select them.
What type of connector is on the end of the corded mouse's cord?
If it's USB or PS/2...
Are you using a simple adapter to adapt it to another type of port? If you are....
- it won't work unless the mouse is a"combo" mouse that is designed and wired up to be used with both types of ports
- if it is a"combo" mouse, there are USB to PS/2 adapters for mice - often colored green - and USB to PS/2 adapters for "combo" keyboards - often colored purple. An adapter for a keyboard may not work with a mouse, and an adapter for a mouse may not work with a keyboard, because the wiring isn't there in the adapter.