Hi there! I see your Print Checks Pro app was working fine before setting up T-Mobile 5G home internet, and now your checks won’t print. Let’s see if we can get this sorted out together.

Just to clarify a couple things first:
- Are you using a wireless or wired printer?
- How is your printer currently connected to the network or computer?
- Does the printer show as “online” or ready in Print Checks Pro?
- Are you able to print from other apps or just Print Checks Pro having the problem?

Sometimes, T-Mobile’s 5G home internet setup uses a gateway/router that handles wireless connections differently, especially separating the 2.4 GHz and 5 GHz Wi-Fi bands or implementing security features that can interrupt printer communication.

Here’s a step-by-step approach to troubleshoot:

1. Check Printer Network Connection:
- Ensure your printer is connected to the same network as your PC. T-Mobile routers may separate 2.4 GHz and 5 GHz bands with different network names (SSIDs). Many printers only support 2.4 GHz Wi-Fi.
- If your printer supports only 2.4 GHz, connect it to that network rather than 5 GHz.

2. Verify Printer Status:
- On your PC, open "Printers & scanners" settings and see if your printer is listed and showing as "Ready".
- Try printing a test page from Windows directly to confirm basic communication.

3. Create a Separate Printer Network (if needed):
- Some T-Mobile gateways allow creating a separate Wi-Fi network or "Guest network" on a 2.4 GHz band with lower security settings.
- Connect your printer to that network and your PC to the main network to see if it helps printer communication.

4. Firewall or Security Settings:
- Check if the T-Mobile gateway firewall or security settings are blocking printer discovery or communication.
- Temporarily disable firewall/security or open relevant ports for printing to test.

5. Restart Devices:
- Restart your router/gateway, printer, and PC to refresh network connections.

6. Use a Wired Connection:
- If wireless continues to be an issue and your printer supports Ethernet, try connecting the printer directly via Ethernet cable to the router.

7. Driver and Software Check:
- Ensure you have the latest printer drivers installed on your PC.
- Restart Print Checks Pro after network changes.

If you want, I can walk you through some of these steps with more details based on your current setup.

Does your printer connect wirelessly or via cable? And have you noticed any indicator lights or error messages on the printer itself? That info will help me guide you better!

Also, I found a few user discussions and videos suggesting setting up a split network or ensuring the printer connects specifically to the 2.4 GHz band of T-Mobile’s 5G gateway can fix this issue10 5.

Let me know what you find!