A white background test typically appears when a website, app, or device fails to load properly. This issue is often referred to as the "White Screen of Death" and can be caused by various problems such as coding errors, plugin conflicts, failed updates, or low memory. When a white screen shows up, there is usually no error message—just a blank screen—which makes troubleshooting more difficult. Common solutions include clearing the cache, disabling plugins or extensions, checking for recent updates, or restarting the device. In more advanced cases, technical support may be needed to inspect backend files or settings.