A compact reference to hardware compatibility, network diagnosis, mobile support, virtualization, printing, and fault isolation.
| Situation | First distinction |
|---|---|
| USB-C accessory fails | Connector shape versus supported data, power, and video capabilities |
| Storage upgrade fails | Form factor versus interface versus protocol |
| Computer does not start | No power versus no POST versus no boot versus no display |
| Network access fails | Link versus addressing versus gateway versus DNS |
| Printer issue occurs | Image-quality defect versus paper-feed path versus device detection |
| Phone behaves unexpectedly | App, account, radio, accessory, power, or thermal path |
| VM rollback is needed | Snapshot for short-term rollback; backup for independent recovery |
For fuller explanations, use the endpoint support reference.