HP dx2358 Service Reference Guide: HP Compaq dx2355 MT/dx2358 MT Business PCs, - Page 90

Troubleshooting Without Diagnostics Diagnostic Front Panel LEDs and Audible Codes Diagnostic Front Panel LEDs and Audible Codes Activity Beeps Possible Cause Recommended Action Green Power LED On. None Computer on. None Green Power LED flashes every two seconds. None Computer in Suspend to RAM mode (some models only) or normal Suspend mode. Not support wake up by mouse/ keyboard. Should be Press Power button. CPU Fan weak 2 (RPM < 600) or not turning, Display Warning message and Long Beep for 5 sec and shut down. System Fan weak (RPM < 600) or not turning, Display Warning message and Long Beep for 5 sec and shut down. Processor thermal protection activated: A fan may be blocked or not turning. OR The heatsink/fan assembly is not properly attached to the processor. 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 Pre-video memory 1. Reseat DIMMs. Power on the error. 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 Pre-video graphics For systems with a graphics card: error. 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. D-22 489243-001 Service Reference Guide