Dell P2421DCc User Manual page 5

Vertical Extension . . . . . . . . . . . . . . . . . . . . . 57
Rotating the Monitor . . . . . . . . . . . . . . . . . . . . . . . . 58
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Built-in diagnostics . . . . . . . . . . . . . . . . . . . . 62
Setting USB-C Prioritization when USB-C Charging is set
to On During Power Off . . . . . . . . . . . . . . . . . . 64
Common problems . . . . . . . . . . . . . . . . . . . . . 65
Product-specific problems . . . . . . . . . . . . . . . . 68
Appendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
Safety Instructions. . . . . . . . . . . . . . . . . . . . . 70
FCC notices (U.S. Only) and other regulatory information 70
Contacting Dell. . . . . . . . . . . . . . . . . . . . . . . 70
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