HP Dx2250 HP Compaq dx2250 Business PC, Service Reference Guide, 1st Edition - Page 117
Interpreting POST Diagnostic Front Panel LEDs - no video
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Interpreting POST Diagnostic Front Panel LEDs This section covers the front panel LED codes that may occur before or during POST that do not necessarily have an error code or text message associated with them. NOTE: If you see flashing LEDs on a PS/2 keyboard, look for flashing LEDs on the front panel of the computer and refer to the following table to determine the front panel LED codes. Recommended actions in the following table are listed in the order in which they should be performed. Replace the system board or power supply only as the last resort. Activity Green Power LED On. Green Power LED flashes every one second. Possible Cause Recommended Action Computer on. None Processor thermal protection 1. Ensure that the computer air vents are not blocked activated: and the processor cooling fan is running. A fan may be blocked or not 2. Open hood, press power button, and see if the turning. processor fan spins. If the processor fan is not spinning, make sure the fan's cable is plugged onto OR the system board header. Ensure the fan is fully/ The heatsink/fan assembly is properly seated or installed. not properly attached to the processor. WARNING! Rotating fan blades can cause serious bodily harm. Be sure to keep your hands away from the rotating blades. 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. Green Power LED flashes every two seconds. Computer in Suspend to RAM Press any key or move the mouse to wake the computer. mode (some models only) or normal Suspend mode. Green Power LED flashes five Pre-video memory error. times, once every second, followed by a two second pause. CAUTION: To avoid damage to the DIMMs or the system board, you must unplug the computer power cord before attempting to reseat, install, or remove a DIMM module. 1. Reseat DIMMs. 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. ENWW Interpreting POST Diagnostic Front Panel LEDs 111