Dell OptiPlex 755 User's Guide - Page 346

Power Light Problem Description Suggested Resolution Blinks green several A configuration error exists. times and then turns off Check the diagnostic lights to see if the specific problem is identified (see "Diagnostic Lights" on page 347). Solid yellow The Dell Diagnostics is running a If the Dell Diagnostics is running, test, or a device on the system board allow the testing to complete. may be faulty or incorrectly installed. If the computer does not boot, contact Dell for technical assistance (see "Contacting Dell" on page 370). Blinking yellow A power supply or system board failure has occurred. See "Power Problems" on page 339. Solid green and a beep code during POST A problem was detected while the BIOS was executing. See "Beep Codes" on page 350 for instructions on diagnosing the beep code. Also, check the diagnostic lights to see if the specific problem is identified (see "Diagnostic Lights" on page 347). Solid green power light and no beep code and no video during POST The monitor or the graphics card may Check the diagnostic lights to see if be faulty or incorrectly installed. the specific problem is identified (see "Diagnostic Lights" on page 347). See "Video and Monitor Problems" on page 343. Solid green power light and no beep code but the computer locks up during POST An integrated system board device may be faulty. Check the diagnostic lights to see if the specific problem is identified (see "Diagnostic Lights" on page 347). If the problem is not identified, contact Dell for technical assistance (see "Contacting Dell" on page 370). 346 Solving Problems