Dell OptiPlex 755 Quick Reference Guide - Page 66

Power Light Problem Description Suggested Resolution Solid green and a A problem was detected while beep code during the BIOS was executing. POST See "Beep Codes" on page 70 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 66). Solid green power light and no beep code and no video during POST The monitor or the graphics Check the diagnostic lights to card may be faulty or incorrectly see if the specific problem is installed. identified (see "Diagnostic Lights" on page 66). See "Video and Monitor Problems" in the User's Guide. Solid green An integrated system board power light and device may be faulty. no beep code but the computer locks up during POST Check the diagnostic lights to see if the specific problem is identified (see "Diagnostic Lights" on page 66). If the problem is not identified, contact Dell for technical assistance (see "Contacting Dell" in the User's Guide). Diagnostic Lights CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. To help troubleshoot a problem, your computer has four lights labeled 1, 2, 3, and 4 on the front panel. When the computer starts normally, the lights flash before turning off. If the computer malfunctions, the sequence of the lights help to identify the problem. NOTE: After the computer completes POST, all four lights turn off before booting to the operating system. 66 Quick Reference Guide