HP dx2355 Troubleshooting Guide: HP Compaq Business Desktops dx2355/dx2358 Mic - Page 22

Troubleshooting Diagnostic Front Panel LEDs and Audible Codes Activity Beeps Recommended Action Green Power LED On. None None Green Power LED flashes None every two seconds. Not support wake up by mouse/keyboard. Should be Press Power button. CPU Fan weak 2 (RPM < 1000) or not turning, Display Warning message and Long Beep for 5 sec and shut down. System Fan weak (RPM < 1000) or not turning, Display Warning message and Long Beep for 5 sec and shut down. 1. Ensure that the computer air vents are not blocked and the processor cooling fan is running. 2. Open hood, press power button, and see if the processor fan spins. If the processor fan is not spinning, make sure the fan's cable is plugged onto the system board header. Ensure the fan is fully/properly seated or installed. 3. If fan is plugged in and seated properly, but is not spinning, then replace processor fan. 4. Reseat processor heatsink and verify that the fan assembly is properly attached. 5. Contact an authorized reseller or service provider. 1 short beep and 1 long beep followed by a three second pause. 2 Bad memory or memory configuration error. 1. Reseat DIMMs. Power on the system. 2. Replace DIMMs one at a time to isolate the faulty module. 3. Replace third-party memory with HP memory. 4. Replace the system board. 2 short beeps and 1 long beep followed by a three second pause. 3 No graphics card installed or graphics card initialization failed. For systems with a graphics card: 1. Reseat the graphics card. Power on the system. 2. Replace the graphics card. 3. Replace the system board. For systems with integrated graphics, replace the system board. Troubleshooting Guide www.hp.com 2-12