At this point it doesn't sound like your Bullet is bad. Once you get into the Bullet we can help you set it up to make access easy.
When your wireless is connected to the internet
the computer tends to prefer that connection and send all information in the address bar out to the internet
rather than to the device on your LAN. This means you don't find the Bullet.
If your Bullet is setup correctly it will be assigning an IPv4 to your computer of 192.168.1.xxx based on the 192.168.1.2 address of the Bullet. If you see a 192.168.1 address assigned to your computer LAN and your wireless card is disconnected or disabled then the 192.168.1.2 address should take you to the Bullet.
If your computer doesn't get an IP then it should set a self-assigned address for the LAN IP of 169.254.xxx.xxx. If this is the case then you can use the Bullets Auto IP alias to connect to the Bullet unless your vendor disabled this which I consider a dumb move. You should see the IP alias address of the Bullet in the "details" window of the Discovery Tool. The Bullet Auto IP address can be calculated if necessary by taking the last 2 pairs of Hexidecimal numbers in the MAC address shown on the base of the Bullet and converting them to Decimal and using them as the last 2 groups of numbers in the 169.254.xxx.xxx subnet. There are many online converters available, just google
"hexidecimal to decimal". For those of you with Bullet 2HP's rather than M2HP's the Discovery tool will not show the Bullet self-assigned address but it still works, you just have to do the conversion to use it to access the Bullet the first time. I just hate to set my computer to a static IP because no matter how many times I have done it I still tend to forget to go back to DHCP before using my browser.
As a last resort we'll do a reset to factory defaults by holding down the reset switch on the base of the Bullet for about 10 seconds until the signal lights flash. If you need to do this you must be careful not to damage the switch. It takes a light touch and it is possible break this surface soldered switch off the circuit board. After you reset the Bullet give it about a minute to stabilize then pull power for 10 seconds and reapply it to reboot. Allow time for your computer and Bullet to negotiate all there automatic settings.
After you do a reset the Bullet will be set as a Client/Bridge with the following settings:
Static IP: 192.168.1.20
Username = ubnt
Password = ubnt
Auto IP Alias enabled
By using the Discovery Tool you should be able to access the Bullet by using the Auto IP Alias shown in the "Details" window of the Discovery Tool. This does not require changing the IP of your LAN to a static IP.
Once you get into the Bullet I can email
you a configuration file which is installed from the AirOS "System" tab. This will set your Bullet up for use on your boat in one operation.