Dell OptiPlex 755 User's Guide - Page 14
Power Lights, Beep Codes, System Messages, Dell Diagnostics, Drivers, System Lights, Diagnostic Lights
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Page 14 highlights
Lockups and Software Problems 336 The computer does not start up 336 The computer stops responding 336 A program stops responding 336 A program crashes repeatedly 337 A program is designed for an earlier Windows operating system 337 A solid blue screen appears 337 Other software problems 337 Memory Problems 338 Mouse Problems 338 Network Problems 339 Power Problems 339 Troubleshooting Power Problems 339 Power Supply Self-Test 340 Printer Problems 341 Scanner Problems 342 Sound and Speaker Problems 342 No sound from speakers 342 No sound from headphones 343 Video and Monitor Problems 343 The screen is blank 343 The screen is difficult to read 343 3D image quality is poor 344 Power Lights 344 System Lights 345 Diagnostic Lights 347 Beep Codes 350 System Messages 351 Dell Diagnostics 353 When to Use the Dell Diagnostics 353 Starting the Dell Diagnostics From Your Hard Drive . . . . . 353 Starting the Dell Diagnostics From the Drivers and Utilities CD (Optional 354 Dell Diagnostics Main Menu 355 Drivers 356 14 Contents