DSi XL shows white screen after booting.

It's possible that your DSi is experiencing a software or hardware issue that's causing it to display a white screen. Here are some steps you can try to troubleshoot the issue:

1. Try a hard reset: Press and hold down the power button for 10 seconds to turn off the console. Then turn it back on again and see if the issue is resolved.
2. Remove any game cartridges or SD cards: Sometimes, faulty or incompatible game cartridges or SD cards can cause the DSi to display a white screen. Remove any game cartridges or SD cards from the console and see if the issue is resolved.
3. Check for firmware updates: Check if there are any firmware updates available for your DSi. To do this, go to the settings menu on your DSi and select "System Update." If there are any updates available, follow the on-screen instructions to download and install them.
4. Contact Nintendo support: If none of the above steps work, it's possible that your DSi may have a hardware issue. Contact Nintendo support for further assistance. They may be able to provide you with repair options or suggest additional troubleshooting steps.

Make sure every ribbon cable is firmly connected. Some may have gotten loose over time.